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2.2 lb (1 k) spinach, washed, cooked and chopped
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3 tablespoons unsalted butter
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1 lb (450 g) ricotta cheese
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½ cup grated parmesan cheese
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5.5 lb (2.5 k) tomatoes, peeled, seeded, and chopped
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2 tablespoon basil, chopped
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12 rectangles 7 x 4 inches (13 x 9 cm) precooked or fresh lasagna pasta
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1 cup mozzarella cheese, grated
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