This is one of the method’s real advantages, and it depends on doing it at the right temperature.

Reheat at the Cooking Temperature

Food cooked to a given temperature can be brought back to it without cooking further, because it cannot exceed the bath.

A steak cooked at fifty-five and reheated at fifty-five comes out as it went in. Reheated in a pan or a microwave, it overcooks.

That is why batch cooking works with this method and not with most others.

The Practical Sequence

• Set the bath to the original cooking temperature
• Drop the sealed bag in from the fridge
• Allow time for the centre to reach temperature
• Which depends on thickness, and is longer from frozen
• Then sear or finish at the point of serving

Containers large enough to run several bags at once, of the kind catalogued at https://everie.us.com/, make this practical for a household rather than for one portion.

Label the Temperature

The reason labelling matters here more than usual. Without knowing what a bag was cooked at, you cannot reheat it correctly.

Contents, temperature and date, on every bag before it goes into the fridge or freezer.

From Frozen

Bags can go into the bath frozen, which takes considerably longer to come to temperature.

Roughly doubling the come-up time is a reasonable starting point, and thicker items take longer still.

Do Not Reheat Twice

Portion before storing so you reheat only what will be eaten.

Repeated heating and cooling cycles are both a quality and a food safety problem.

It Is Not a Holding Method

Leaving food in a bath for hours after it is ready is a different thing from reheating, and long holding has its own guidance.

Sear at the End

Which restores the crust reheating removes.

Serve Immediately

Rather than holding again.

Never Reheat Above the Cooking Temperature

Which cooks it further and undoes the original result.

Allow for Thickness

Come-up time depends on it, from chilled and more from frozen.

Sear After Reheating

Which restores the crust.

Portion Before Storing

So nothing is heated twice.

It Beats a Microwave

Which heats unevenly and overcooks the edges.

Set the Bath First

So it is at temperature before the bag comes out of the fridge.