skinless chicken • potatoes (peeled and cut into big cubes) • large onion, sliced • tomatoes, chopped • garlic cloves (peeled) • ⁄2 inch gingerroot, minced • ⁄4 tablespoon garam masala • cumin powder • coriander powder • ⁄2 teaspoon chilli powder • ⁄4 teaspoon turmeric powder • water (for gravy) •