You should be able to find garam masala in the spice aisle at your grocery store, but if not, you can make a homemade version in a pinch. Mix together 1 tbsp. cumin, 1.5 tsp. coriander, 1.5 tsp. cardamom, 1.5 tsp. black pepper, 1 tsp. cinnamon, 1/2 tsp. cloves and 1/2 tsp. nutmeg.