Summer Squash, Leek, Spinach & Parmesan Gratin

Summer Squash, Leek, Spinach & Parmesan Gratin was pinched from <a href="https://www.finecooking.com/recipe/summer-squash-leek-spinach-parmesan-gratin" target="_blank" rel="noopener">www.finecooking.com.</a>

"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
2 Tbs. unsalted butter; more for the baking dish
1-1/2 cups coarse fresh breadcrumbs (from about 2 English muffins)
1-1/2 cups coarsely grated Parmigiano-Reggiano or Grana Padano (about 7 oz.)
1/2 cup extra-virgin olive oil; more as needed
2-1/2 Tbs. coarsely chopped fresh thyme leaves
Kosher salt
4 large leeks, white and lightgreen parts halved lengthwise and cut crosswise into 1/4-inch-thick slices (about 4 cups)
2 tsp. minced garlic
6 oz. baby spinach (about 6 packed cups)
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)
Freshly ground black pepper
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