Combine the shallots and oil in a casserole. Cover and cook in the microwave on full power for 3-4 minutes until soft, stirring once during cooking. Stir in garam masala and grated ginger. Cover and cook on full power for 1 minute. Stir in the chopped tomatoes. Cook uncovered on full power for 5 minutes or until mixture is thicker. Stir occasionally during cooking. Add the beans and season with salt and pepper. Cover and cook on full power for 3-4 minutes, stirring occasionally until the beans are hot.