I make this brazilian dish quite often and there is a post with the recipe on this blog if you do a search. This was the best one I've made so far because I finally found the dried shrimp that the recipe calls for.
Cut pork across grain into thin slices, then into strips. Combine 2tsp each cornstarch and soy sauce with 1/2 of the garlic in a small bowl,m stir in the pork. Let stand 30 mins. Meanwhile , combine water, 1 tbspn cornstarch remaining soy sauce and and red pepper. Set aside. Heat 1 tbsp oil in hot wok or large skillet over high heat. Add pork and stir fry 2 minutes: remove. Heat remaining 2 tspn of oil in the same pan and over a med high heat add the vegetables and the remaining garlic. Stir in the tomatoes allow to heat then stir in cornstarch to thicken. Cook gently and then serve over rice.