The Majesty of Tomatoes

Its high enough in umami taste (savory amino acids) to rival mushrooms and meat. Its a fruit from the new world that penetrated europe and became the only ingredient to be be featured among the 5 classic sauces of french cuisine.

Food Pairing lists the following common pairings

Fruit:
Grapefruit
Grapes
Banana
Pear
Sour Cherry
Strawberry
Raspberry
Kiwi
Orange
Black currant

Legume:
Beans
Truffle
Soybean
Pea

Seafood:
Mussel

Herb/Spice:
Tarragon
Cinnamon
Clove
Laurel (bay leaf)
Coriander
Pepper
Anise
Basil
Parsley
Oregano

Cultured Dairy:
Yoghurt
Buttermilk

Culinary Artistry Lists in alphabetical order the following common pairings:

Anchovies
Arugula
Basil
Bread crumbs
Champagne
Cheese – feta, goat, mozzarella, parmesan
Chiles
Chives
Cucumbers
Eggs
Garlic
Lemon
Lovage
Marjoram
Mint
Mushrooms
Olive oil
Olives
Onions
Oregano
Parsley
Pasta
Pepper, black
Peppers, especially red
Saffron
Salt
Seafood
Shallots
Sugar
Tarragon
Thyme
Vinegar – balsamic, sherry, wine