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Potato, Zucchini, and Tomato Gratin

Potato, Zucchini, and Tomato Gratin Ingredients: tomatoes, red, ripe, raw, year round average oil, olive, salad or cooking potatoes, raw, skin squash, summer, zucchini, includes skin, raw spices, thyme, dried cheese,...

Potato, Zucchini, and Tomato Gratin

Ingredients:
tomatoes, red, ripe, raw, year round average
oil, olive, salad or cooking
potatoes, raw, skin
squash, summer, zucchini, includes skin, raw
spices, thyme, dried
cheese, parmesan, hard

Directions:
Preheat oven to 250F.
Line rimmed baking sheet with parchment paper.
Arrange tomato halves, cut side up, on prepared sheet.
Drizzle 1/2 cup olive oil over tomatoes; sprinkle with salt.
Roast in oven until soft, about 1 hour.
Cool slightly.
Using fingertips, slip skins off tomato halves.
Set tomatoes aside.
Increase oven temperature to 375F.
Line another rimmed baking sheet with parchment paper.
Combine potato slices and 1/4 cup olive oil in medium bowl; sprinkle with salt and pepper and toss to coat.
Arrange potatoes in single layer on prepared sheet; drizzle any oil from bowl over.
Roast until soft and beginning to brown, about 25 minutes.
Cool.
Heat 2 tablespoons oil in large nonstick skillet over medium-high heat.
Sprinkle zucchini with salt and pepper.
Working in batches, add zucchini to skillet; saute until lightly browned, about 1 minute per side.
Transfer to paper towels to drain.
Cool.
Lightly oil 13x9x2-inch ceramic or glass baking dish.
Starting at outer edges of baking dish and working toward center, alternate potato slices, zucchini slices, and tomato halves, overlapping slightly.
Sprinkle with salt and pepper, then thyme leaves and Parmesan.
DO AHEAD: Can be made 1 day ahead.
Cover and chill.
Preheat oven to 350F.
Bake gratin uncovered until cheese melts and juices bubble at edges, about 35 minutes.