Prepare your leg of lamb by slicing it into ½ inch steaks, cutting against the grain.
Season with 1 teaspoon salt and 1 teaspoon pepper.
Coat in flour.
Heat olive oil in your pressure cooker on saute setting. Sear lamb steaks for a few minutes on each side, working in batches. Remove from pot and let stand on a plate.
Add diced onion, bell pepper, and carrot to the pot. Cook for 2 minutes.
Toss in garlic and mushrooms.
Add fresh thyme and dried parsley. Cook for 1 minute.
Pour in white cooking wine and cook for 1 minute.
Add seared lamb back to the pot.
Pour in diced tomatoes and crushed tomatoes.
Add in 1 teaspoon salt, 1 teaspoon pepper, bay leaf, dried rosemary, and thyme sprigs.
Seal lid and cook on high pressure for 15 minutes, allowing a 25 minute natural release.
Serve with hot cooked pasta, rice, or mashed potatoes.