Under Vacuum Sealing: How It Works & What to Make

Under vacuum sealing, also known as sous vide, is a cooking method where food is sealed in a vacuum bag and cooked in a precisely controlled water bath. This technique ensures even cooking, locks in moisture and flavor, and delivers restaurant-quality results at home. It works because the water bath maintains a constant temperature, so you can achieve perfect doneness every time, from tender steaks to silky custards.

Ingredients

4 (6 oz / 170 g) boneless, skinless chicken breasts
2 tbsp (30 ml) olive oil
1 tsp (5 g) salt
1/2 tsp (2.5 g) black pepper
4 sprigs fresh thyme (or 1 tsp dried)
2 cloves garlic, smashed
1 lemon, sliced into rounds
2 tbsp (30 g) unsalted butter (optional)

Instructions

Preheat your sous vide water bath to 150°F (65°C) for chicken breasts. If your model requires a specific setting, follow the manufacturer’s instructions.
Pat the chicken breasts dry with paper towels. Season both sides with salt and pepper.
Place each chicken breast in a vacuum-seal bag or a heavy-duty resealable freezer bag. Add a sprig of thyme, a smashed garlic clove, and a lemon slice to each bag. Drizzle with olive oil.
Seal the bags using a vacuum sealer. If using a zipper-lock bag, use the water displacement method: slowly lower the bag into a pot of water, letting the water push out the air, then seal it just above the water line.
Once the water bath reaches temperature, submerge the sealed bags completely. Use a clip or a heavy plate to keep them submerged if needed. Cook for 1 hour 45 minutes.
After cooking, remove the bags from the water bath. Carefully open them and transfer the chicken to a plate. Pat the chicken dry with paper towels (this helps with searing).
If you want a golden crust, heat a cast-iron skillet over high heat with a little oil. Sear the chicken for 1–2 minutes per side until browned. For a butter finish, add the butter to the pan and baste the chicken for the last 30 seconds.
Let the chicken rest for 5 minutes before slicing. The safe minimum internal temperature for poultry is 165°F (74°C) per USDA FSIS, but because sous vide cooks at lower temperatures for longer, the chicken will be safe if it has been held at 150°F for at least 3 minutes—your sous vide does this automatically. Still, you can check with a thermometer to confirm.

Tips

Use a reliable vacuum sealer: If you don’t have one, zipper-lock bags with the water displacement method work just as well for sous vide.
Don’t overcrowd the bath: Leave space between bags so water circulates freely, ensuring even cooking.
Season generously: Vacuum sealing can mute flavors, so don’t be shy with salt and aromatics.
Pat dry before searing: Moisture is the enemy of browning; dry the surface thoroughly for a good crust.

Serving Suggestions

Serve the chicken sliced over a bed of creamy polenta or alongside roasted vegetables. A simple pan sauce made from the bag juices, a splash of white wine, and a pat of butter elevates the dish. For a lighter meal, slice it over a crisp green salad with lemon vinaigrette.

Variations

Herb butter: Replace the olive oil with 2 tablespoons of herb-infused butter (e.g., rosemary and garlic) for extra richness.
Asian marinade: Swap the thyme and lemon for 2 tablespoons soy sauce, 1 tablespoon honey, and 1 teaspoon grated ginger.
Vegetarian option: Use firm tofu or thick carrot slices; cook at 170°F (77°C) for 30 minutes, then sear.
Different proteins: This technique works for pork chops (140°F/60°C for 1 hour) or salmon (125°F/52°C for 45 minutes). Adjust times and temperatures accordingly.

Storage and Reheating

Cooked chicken can be refrigerated in an airtight container for up to 4 days. To reheat, place it in a 150°F (65°C) water bath for 20–30 minutes, or sear briefly in a hot pan. Avoid microwaving, as it can dry out the meat. For longer storage, freeze the cooked, sealed chicken for up to 3 months; thaw overnight in the refrigerator before reheating.

Frequently Asked Questions

Can I use a regular zipper bag instead of a vacuum sealer? Yes, the water displacement method works well. Just ensure the bag is rated for sous vide temperatures (most freezer bags are).

Why is my chicken rubbery? This usually happens when the temperature is too high or the cooking time is too long. Stick to 150°F (65°C) for breasts and don’t exceed 2 hours.

Is sous vide safe for chicken? Yes, as long as you cook to the recommended temperature and time. The USDA FSIS states that chicken is safe when held at 150°F for at least 3 minutes, which sous vide achieves.

Can I cook from frozen? Yes, add 30–45 minutes to the cooking time. Make sure the bag is sealed well and the water bath is at the target temperature before adding.

Do I need a special vacuum sealer? Not necessarily. A basic vacuum sealer works, but even a hand pump or zipper bags are fine. The key is removing as much air as possible.

Why does my chicken look pale? That’s normal—sous vide doesn’t brown the surface. Searing afterwards gives it that appetizing color and flavor.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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