What you'll need:
3 chicken breasts, cut into pieces
3-4 TbSp of vinegar
juice from 1 lemon
1/2-3/4 tSp of Turmeric powder
1/2 TbSp of ginger-garlic paste
A little garam masala powder (optional)
salt & pepper to taste
Except for the onions and tomatoes, mix the ingredients with the chicken and allow it to marinate for about 2-3 hours (or more). After marinating it, slice the onions and chop the tomatoes finely. Season with salt and pepper. Sauté the onions and tomatoes in a pan with a little oil until the onions become soft, and then remove from the pan. Add some oil and a little butter in the pan and heat it over medium heat. Once hot, add the marinated chicken pieces into the pan and start cooking (cover when possible). Midway, add the onion and tomato mixture and continue to cook until the chicken is done. In case you want there to be a little gravy, chop a couple of onions and tomatoes more and add to the original chopped mixture. Optionally, if you had some white wine or sherry, you can make an alcohol reduction for the chicken and serve it with that.
Before the chicken is cooked.
After the chicken is cooked.
Sprinkle a little oregano and/or thyme at the end just before serving and voilá! Bon apetit.