Heat oil in pressure cooker, add onion and chilli. Cook till soft. Add tin tomatoes and water. Stir till combined. Add salt pepper and cumin. Place chicken breasts on rack above tomato mixture. Turn pressure cooker to 15 minutes and allow steam to escape at end. Remove chicken and using two forks shred. Turn pressure cooker to sauté and cook till salsa is reduced to desired consistency.

Grate cheese, slice lettuce and heat taco shells. Make up tacos. 😀🌮