In a nonstick skillet set over moderately high heat, warm the oil until hot. Add the onion and cook, stirring occasionally, 5 minutes. Add the veal, beef, and salt and pepper to taste, and cook, stirring, until no longer pink. Add the garlic, tomatoes, gingerroot, Garam Masala, and chilies, and cook, stirring, for 5 minutes. Add the peas and continue to cook over moderate heat, stirring occasionally, for 10 minutes more, or until flavors blend. Stir in the lemon juice and cilantro and correct seasoning, adding more salt if necessary. Either transfer to a bowl and serve with warm rotis or tortillas or spoon Keema down center of bread and roll up like a burrito