Chinese Sweet 'N Sour Beef Recipe

• 1 pound top round steak, 1/2 to 3/4 inch thick or possibly pound boneless pork
• Natural meat tenderizer
• 5 tbsp. oil
• 1 lg. onion, cut in wedges
• 1 (8 1/2 ounce.) can water chestnuts, liquid removed and sliced
• 1 green pepper, cut in squares
• 1 (13 1/2 ounce.) can pineapple chunks, undrained
• 2 tbsp. catsup
• 1 tbsp. wine vinegar
• 2 tbsp. soy sauce
• 2 1/2 teaspoon sugar, or possibly to taste
• 1 tbsp. cornstarch
• 3 tbsp. cool water
• 2 hard ripe tomatoes, cut in eights
• Warm cooked rice

Directions