Stuffed Pita Pockets

Ingredients

• 2 Tbsp. butter or margarine
• 1 medium onion, chopped
• 2 medium tomatoes, chopped
• 1 lb. ground beef
• 1 tsp. salt
• 1/2 tsp. pepper
• 2 Tbsp. parsley, chopped
• 1 pita loaf for each sandwich
• lettuce