Sous Vide Cooking

Time and Accurate Temperature

Sous vide at home – Confit duck legs – Multiple tries

by on Apr.07, 2010, under Recipes, Time and Accurate Temperature

Today I wanted to experiment confit duck legs. The idea came to my mind while reading Casqu8′s blog who cooked some weeks ago a couple of confit duck legs.

I copied Casqu8 recipe consisting in curing the meat with salt, thyme and bay leaf. I vaccum sealed the pouch and stored it in the fridge for 24 hours.

I rinced the legs with clear water and took care taking off the thyme and bay leaves. No need to leave them in the pouch, otherwise the final flavour of these aromats will be too strong!

Then I vaccumed sealed the duck leg with some duck fat (3 tablespoons) I purchased in a supermark (300 gr cost EUR 4).

In my first try I cooked sous vide the duck leg at 80°C during 9 hours with my immersion circulator.

I have not be satisfied with the final result. The confit duck legs were to dry in my opinion. Casque8 recommended me setting my immersion circulator at 75°C instead of 80, raising the cooking time to 20 hours and adding more duck fat (I have added 150 g per leg). The result was much better and I liked that confit duck leg very much.
I also tried 75°C during 24 hours with the same amount of duck fat. I had the feeling the additional 4 hours have not improved the texture of the meat. In my opinion the 20 hours duck legs cooked sous vide were far better.

Don’t forget to sear the legs both sides in a hot pan in order to obtain a crispy appearance, 20 to 30 secondes are enough.

Bon appétit!

Jean-François

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Are Douglas Baldwin Sous Vide Cooking Tables Correct? Review of Baldwin’s table with a 30 mm Salmon Mi-Cuit

by on Mar.15, 2010, under Books, Equipments & Accessories, Time and Accurate Temperature

As you may already know Douglas Baldwin “Practical Guide to sous Vide Cooking” is to date probably one of the only serious source of information about sous vide that you can download for free on internet (English, Portuguese/Brazil, French and German). The revolution of this document is to allow home cooks cooking sous vide with tables. No need of an external probe to be inserted in the pouch in order to get the internal temperature of the food. Before using Baldwin tables I purchased most of the books available but none of them were mentioning the thickness of food as a key information in order to cook sous vide. Therefore, in my opinion, all these books can be considered as art books but not cooking books where recipes can be reproduced.

I have experimented Baldwin tables for a while now and I have to admit that I have never been sick or disappointed by the degree of doneness according to the temperatures given.

Nevertheless I realized that nobody on the net ever discussed if Baldwin tables are correct or not. Do I have to accept the fact that everybody is assuming these tables are accurate?

This the reason why I decided to purchase an external penetration probe and verify by myself. For those who would like to purchase such equipment I want to say that I made a mistake in my previous post when buying the needle probe from Thermoworks. The one that should be used for sous vide (water proof) is THS-113-181 only (see on the right of the picture). The needle is very thin (1 mm) and long enough to get inside a 7 cm thick beef fillet (incl. the turbigomme foam).

For my first test of Baldwin table I took a cut of salmon, 30 mm thick that I wanted to cook “mi-cuit” at 47°C. Douglas Baldwin table indicates 1 hour and 2 minutes cooking time. As mentioned in Baldwin document I raised the temperature of my immersion circulator of 0.5°C (47.5°C) in order to be sure to reach the target temperature of 47°C.

In order to comply totally with Baldwin table I took care the core temperature of the salmon was 5°C. This step made me realizing that my fridge is definitely not cold enough as the core temperature of my salmon was 10°C before chilling it! As illustrated on the picture I immersed the pouch in iced water for some minutes.

As mentioned above I set my immersion circulator at 47.5°C for 1:02 and noted frequently the data in order to make a graph out it.

And the result is EXCELLENT!

I was very surprised to see how fast the temperature was raising during the first minutes. I was also having some doubts when the countdown of my sous vide equipment was indicating 22 minutes left while the core temperature of the salmon was 36.6°C. The last tenth of degrees take really long to be reached and I now understand why you should set your sous vide appliance 0.5°C above the target temperature…if you don’t it will take ages before you really reach the target temperature.

Jean-François

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Polyscience compaires an immersion circulator and a non stired water bath

by on Jan.23, 2010, under Equipments & Accessories, Time and Accurate Temperature

Today Polyscience made the demonstration that a non stired water bath cannot be as efficient as an immersion circulator. It is funny to see that Polyscience directly mentions Sousvidesupreme in the TAG of the article.

Polyscience video indicates clearely that a non stired water bath has a longer response time to reach the desired core temperature. Therefore, it is obvious that Douglas Baldwin cooking tables sould be used with care. Douglas Baldwin indicates in the Pratical Guide to Sous Vide “With all these digital controllers, I highly recommend setting the temperature offset (measured near the temperature at which you wish to cook) using a high quality digital thermometer. Indeed, at the default settings the thermistors used in the above controllers can easily be off 2–4°F (1–2°C)”.

Freshmealsolutions mentions clearely in the user manual of the SousVideMagic : “If you don’t have a proper food core temperature sensor probe, always cook at desired core temperature settings for the duration as specified by reliable recipes with an additional safety factor of at least 25% longer…”
In addition the manual indicates “The default settings are designed to overshoot 1 or 2 degree higher for safety reasons. You can reduce the overshoot by making your own PID adjustments. See the document “PID Tuning”.”

YouTube Preview Image

Jean-François

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Pear cooked Sous Vide at 80°C during 30 minutes

by on Jan.02, 2010, under Books, Recipes, Time and Accurate Temperature

sous-vide-poireBruno Goussault’s DVD mentions a recipe of a pear cooked sous vide:

  • 1 pear
  • 30 g chocolate
  • 20 g vanilla sugar (vanilla extract plus sugar)

The recipes mentions puting the pear sous vide and immerse the pouch in a water bath set at a temperature of  8O°C  until the pear is “done”.

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Their is no mention of the cooking time. I checked several times the pear before it becomes too soft and therefore decided to stop cooking the pear after 30 minutes. I chilled the pear and kept it in the fridge one day before serving it.

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The result is a very nicely cooked pear but I can’t say this pear was something special. It was good but nothing amasing. I think the main advantage of this way of cooking pears is the possibility to keep them 15 to 25 days in the fridge (at the condition to keep them in the pouch). This is definitely a very good point for professionnals.

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Jean-François

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Duck Foie Gras cooked sous vide at 58°C during 47 minutes

by on Dec.27, 2009, under Recipes, Time and Accurate Temperature

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In France, during Christmas time, eating foie gras is very popular. Remember that the sous vide method was developed by Georges Pralus in the 70s  in order to cook foie gras in an optimal way.
For the first time I tried to cook myself a duck foie gras sous vide.
First issue is to choose a good raw foie gras of quality…The South Ouest of France is the region where the foie gras is originally produced. If you choose one of those, there is a small risk to make mistakes.

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Then, you must take off the veins of the foie gras (sometimes you can purchase the foie gras without the veins). This is where the problem started…This is not an easy part of work. I looked on internet some videos illustrated the key points and technique to take off veins of a foie gras and then I tried myself. The difficult thing is to find the veins, take them off without destroying the whole structure of the foie gras.

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It was very hard to do. On the right you can see the pieces of foie gras containing the veins and on the left the foie gras I almost totally destroyed!

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Then I added 13g salt per kilo and 3g of pepper per kilo of foie gras. Some people recommend seasoning the foie gras with Armagnac or Porto. I put no alcohol at all.
Next step is to create a “ballotine”.

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The “ballotine” was also not easy to form. I took a food grade plastic wrap, put the foie gras pieces inside and compressed them, first to take off the air but also to create a cylinder. Several plastics wrap pieces were necessary to fulfill this step.

Next step was to vacuum the foie gras in a pouch. I read on internet that the best way to keep a frame while cooking was to use a “shrink” bag. I didn’t have any so I did it with a regular cuisson sous vide bag.

Cooking the foie gras ballotine: my foie gras cylinder was approx. 17 cm long and 6 cm of diameter. The more an ingredient is fat the best it conducts heat. I cooked my ballotine at 58°C during 47 minutes with immersion circulator.
During the cooking process air appeared in the ballotine and my pouche started to float on the surface. I have probably not compressed enough the foie gras and not vacuumed enough the pouch. Therefore I fixed the pouch with a heavy tool down in my cooking pot.

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Next step was to chill the ballotine. As you can see I took this task very seriously.

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My foie gras became slightly brown and a significant amount of yellow fat appeared on one side of the pouch (unfortunately you can’t see it on the picture). I was surprised to see that by ballotine kept its cylinder frame. My worry was to maintain this frame until the total cool down of the foie gras. For this purpose I took a piece of carton I curved like a half-cylinder and place the ballotine inside. After I left the ballotine in the fridge for a night with the carton, the whole ballotine kept its perfect frame of a cylinder.

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The result was really not so bad! With a little bit of fig, the taste was marvelous and the texture fantastic.

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In addition, a little bit of Sauterne Château de Rolland (Barsac) 2004…Très, très bon!

Jean-François

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