INGREDIENTS
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4 large Spanish onions (about 1 pound each), skin-on
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7 tablespoons extra-virgin olive oil
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3 large sprigs fresh thyme, plus 2 teaspoons finely chopped thyme leaves
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Kosher salt and freshly ground black pepper
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1 large clove garlic
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20 ounces spinach, stems removed, washed and dried
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Grated zest of 1 lemon
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2 large eggs, lightly beaten with a fork
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Pinch of cayenne pepper, or more to taste
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1 cup sourdough bread crumbs
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4 ounces feta cheese, crumbled