Rich Sauces

Chopped grape tomatoes and red onions are all you need to create a rich pasta sauce. Saute the onions lightly to soften them. Stir the tomatoes into the pan, mashing them in to release the juices. Simmer the mixture to create a chunky sauce. Add parsley and basil to the sauce for an herbal twist. Sprinkle the sauce with salt, black pepper and garlic powder to give it a spicy kick. A touch of oregano brings Italian flair to the sauce.

Tempting Salads

Red onion and grape tomatoes are a natural pairing when it comes to salads. Slice the tomatoes and onions thinly, or halve the tomatoes, and then toss with vinaigrette dressing to create a simple side salad. Combine chopped tomatoes and onions with lettuce, celery, grated carrots and ranch dressing for a classic taste. Go for an indulgent taste with a mixture of grape tomatoes, red onion, crumbled bacon, new potatoes and blue cheese dressing.

Tantalizing Shish Kebabs

Spearing tomatoes and thick slices of onion onto skewers is a simple way to turn the two ingredients into something special. Serve the skewers cold with ranch or Italian dressing for a quick appetizer. Cook the shish kebabs on the grill to bring out the natural sweetness of the grapes and onions. Brush the vegetables with teriyaki sauce or another grilling sauce, before or after grilling to add a rich taste.

Tasty Sandwiches

Stack sliced tomatoes and onions on bread to create a sandwich worth savoring. Spread some mayonnaise and mustard on the bread for a hint of zing, or add lettuce and cucumber to the sandwich for crunch. Layer grape tomatoes, red onions, feta cheese and spicy brown mustard on Italian bread for a sandwich with zip. Stack tomatoes, onions, green bell peppers, banana peppers, mayonnaise and sunflower seeds on whole-wheat bread to create a spicy vegetarian sandwich.

Savory Soups

Simmer grape tomatoes and onions in broth to turn the sweet vegetables into a silky soup. Choose vegetable broth for a complex background flavor, chicken broth for a mellow taste or beef broth for a meaty flavor. Pour the simmered mixture into a food processor or blender and puree until smooth. Cook a mixture of grape tomatoes, red onion, carrots, celery, basil and vegetable broth for a classic flavor. Make a hearty soup by simmering tomatoes, onion, beef broth, potatoes, salt and pepper.