Gratin of Summer Squash

Yield: 6 Servings
Categories: Vegetables, Side dishes
2tbOlive oil
1smRed onion
3Zucchini
2Plum tomatoes
3Cloves garlic -- minced
1/4tsSalt and freshly ground
Pepper
1tbFresh thyme -- minced
3ozGruyere cheese -- grated
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