Par-boiling

Par-boiling means partially cooking food in boiling water so it can be finished later. The goal is not to fully cook the food, but to cook it just enough that the final cooking step becomes faster and produces better texture.

This technique is most commonly used with root vegetables like carrots, but it also works well for vegetables that would otherwise take a long time to cook evenly, such as Brussels sprouts or thick broccoli stems.

How to do it

1. Bring a pot of salted water to a boil.
2. Add the food and cook until it is just beginning to soften but not fully cooked.
3. Drain immediately.
4. Spread the food out so steam can escape and the cooking stops.

Once cooled, the food can be refrigerated and finished later by roasting, frying, sautéing, or grilling.

Par-frying

Par-frying means frying food briefly at a lower temperature so that it cooks internally but does not yet develop its final crust. The food is then fried a second time at a higher temperature to finish it.

This is the technique behind most restaurant French fries.

Why it works

The first fry cooks the interior and removes moisture. The second fry rapidly creates a crisp exterior without overcooking the inside.

Basic method

1. Fry the food at a moderate temperature (typically around 300–325°F / 150–165°C).
2. Remove once the food is cooked but still pale.
3. Cool completely.
4. When ready to serve, fry again at a higher temperature (around 375°F / 190°C) until crisp and golden.

Between the two frying steps the food can be refrigerated for hours or even a full day.

Blanch and shock

Blanching means briefly boiling vegetables, then immediately cooling them in ice water. This stops the cooking and preserves color, flavor, and texture.

Restaurants often blanch vegetables during prep so they can be quickly finished during service.

How to blanch and shock

1. Bring a pot of salted water to a rolling boil.
2. Prepare a bowl of ice water.
3. Cook the vegetables briefly, usually 30 seconds to a few minutes depending on the vegetable.
4. Transfer immediately to the ice bath.
5. Drain and dry once completely cooled.

The vegetables can then be refrigerated and later finished by sautéing, roasting, or reheating.

Sous-vide pre-cooking

Sous-vide is particularly well suited to make-ahead cooking. Food can be cooked precisely in advance, chilled, and then quickly finished when needed.

Restaurants often cook proteins sous vide during prep and then sear them to order.

Typical workflow

1. Season and vacuum seal the food.
2. Cook sous vide to the desired internal temperature.
3. Chill rapidly in an ice bath if it will be stored.
4. Refrigerate until needed.
5. Finish with a quick sear, roast, or sauce.

Because the interior is already perfectly cooked, the final step only needs to create surface flavor and texture.

Braise then finish

Many braised dishes actually improve after being cooked ahead of time. The slow cooking breaks down connective tissue, and resting time allows flavors to meld and deepen.

Restaurants frequently prepare braises a day or two in advance.

How it works

1. Brown the meat and build the braising liquid.
2. Cook slowly until the meat is tender.
3. Cool and refrigerate the dish.
4. Reheat gently before serving.

During reheating the sauce can be reduced or adjusted, and the dish often tastes richer and more balanced than it did the day it was first cooked.