INGREDIENTS
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1/2 TEASPOON KOSHER SALT, PLUS MORE FOR THE POT
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1/4 CUP -EXTRA--VIRGIN OLIVE OIL
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1 MEDIUM ONION, SLICED
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1 POUND MEDIUM ZUCCHINI, SLICED
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ONE -28--OUNCE CAN WHOLE SAN MARZANO TOMATOES, CRUSHED BY HAND
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1 LOOSELY PACKED CUP FRESH BASIL LEAVES, ROUGHLY CHOPPED
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1 POUND RIGATONI
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1 TABLESPOON UNSALTED BUTTER
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8 OUNCES SHREDDED FONTINA
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1 CUP GRATED GRANA PADANO