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🌡️ Sous vide: cooking by temperature instead of time

A grill cooks by time and hope. A bath set to 54°C cannot overcook the centre — it can only wait for the edge to catch up.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The bath that cannot overcookSee doneness as a temperature ceiling, and a circulating bath as a way to make the whole steak that number.A grill is hotter than the centre you want, so it paints a grey band. A 54°C bath cannot. Water, stirred, delivers that ceiling.
  2. Under vacuum, on purposeSeparate industrial pasteurising-near-boiling from the low-temperature restaurant method, and say what vacuum actually does.Pralus at Troisgros in 1974, Goussault's temperature maps, Robuchon and CREA. The pouch is a heat pipe, not a spell.
  3. Proteins have a thermostatConnect 50–55°C with medium-rare and tenderising, 60°C-plus with juice loss, and long fish cooks with mush.Collagenase and cathepsins work below 60°C. Eggs show the same idea in a shell. Fish is already tender; do not keep helping.
  4. Time is thickness and deathUse thickness-squared heating, the 130°F / 112-minute Food Code row, and the spore problem of cook-chill.Double the thickness, about four times the wait. 165°F is an instant shortcut. Ice the bag if you are not eating tonight.
  5. The sear is a second kitchenPut Maillard at about 150°C and vegetables at 82°C-plus, then go notice a steak's gradient.Sear after. Cook plants hotter. The open question is how much of edge-to-edge pink is ceiling, enzymes, or unwrung juice.

Questions this course answers

Why can a steak in a 54°C water bath not overcook the way a grilled steak can?

Sous vide sets the water to the final doneness. Heat can only flow until the food matches the bath. A grill is hundreds of degrees hotter, so the outside keeps climbing.

What physical fact makes a water bath heat food so much faster than an oven at the same temperature?

Baldwin: water conducts heat about 23 times better than air. Circulation then keeps the whole bath within a fraction of a degree.

Match each name to the sous-vide job they actually did

America's Test Kitchen and CREA agree the bag came from industry. Pralus asked it a restaurant question. Goussault made the low temperature a system.

Why can a chuck roast held at 55°C for a day become as tender as filet?

Baldwin, after Tornberg: collagen begins to dissolve above 50–55°C and collagenase stays active below 60°C. Cook's Illustrated adds cathepsin activity at 54°C.

In the U.S. Food Code table Baldwin reprints, how many minutes must meat be held at 130°F (54.4°C) for the listed pasteurisation?

Food Code / Baldwin Table C.1: 130°F for 112 minutes. Raise the temperature and the wait collapses. The magnet number 145°F is the instant version of the same idea.

Put a safe cook-chill sequence in the order the spores require

Pasteurisation leaves spores. Slow cooling is how they wake. Baldwin: ice water, then a short fridge life or the freezer.

Grounded in trusted sources

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