Season the chicken all over with salt and pepper. In a large frying pan over medium-high heat, melt the butter with the oil. Working in batches if necessary, add the chicken and cook, turning frequently, until browned, about 10 minutes. Transfer the chicken to a platter.

Add the onion and sautué until softened, about 5 minutes. Add the garlic and cook for 1 minute. Stir in the tomato sauce, Worcestershire sauce, cumin, oregano, parsley, thyme, and beer.

Over medium-low heat, cover and cook until the chicken is tender and opaque throughout, about 35 to 40 minutes. Uncover and add the peas. Cover and cook until the peas are warmed through, about 10 minutes more.