"Over the years, I’ve done many Provençal “tians” or gratins of layered summer vegetables, and they’re always a crowd favorite. I love this version: zucchini and summer squash, layered with…..."
INGREDIENTS
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2 Tbs. unsalted butter; more for the baking dish
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1-1/2 cups coarse fresh breadcrumbs (from about 2 English muffins)
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1-1/2 cups coarsely grated Parmigiano-Reggiano or Grana Padano (about 7 oz.)
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1/2 cup extra-virgin olive oil; more as needed
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2-1/2 Tbs. coarsely chopped fresh thyme leaves
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Kosher salt
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4 large leeks, white and lightgreen parts halved lengthwise and cut crosswise into 1/4-inch-thick slices (about 4 cups)
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2 tsp. minced garlic
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6 oz. baby spinach (about 6 packed cups)
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2 lb. summer squash (a mix of varieties and colors), cut crosswise on the bias into 1/4-inch-thick slices (about 4 medium squash)
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Freshly ground black pepper