Step 1

In a mixing bowl, combine 1/2 cup of water or beef stock, vinegar, tomato paste, and spices.

Step 2

Put the London broil inside and cover. Marinate for 3 hours or overnight in the fridge.

Step 3

Remove the beef from the marinade and pat dry.

Step 4

On the Instant Pot, press "saute" and add oil.

Step 5

Add the beef and sear on all sides until brown.

Step 6

Pour in marinade and that one extra cup of water or stock.

Step 7

Lock the lid and cook at high pressure for 20 minutes.

Step 8

Once done, wait for a natural pressure release. When the valve drops (means all the pressure has been released), open the lid and take out the beef.

Step 9

Season with salt and pepper and serve.