"Removing the excess moisture from the spinach is important here. We found that 7-ounce ramekins worked perfectly here, but 6-ounce or 8-ounce ramekins will also work. Be sure to fill the ramekins evenly so that they will all cook at the same rate...."
INGREDIENTS
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1 onion, chopped fine
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2 tablespoons olive oil
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1/2 teaspoon salt
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4 garlic cloves, minced
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12 ounces (1 1/2 cups) whole-milk ricotta cheese
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10 ounces frozen chopped spinach, thawed and squeezed dry
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4 ounces fontina cheese, shredded (1 cup)
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4 large eggs, lightly beaten
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1/4 teaspoon pepper
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2 plum tomatoes, cored, sliced 1/8 inch thick, and patted dry