"Just in time for prime picnic season, a melty summer sandwich that wants to go everywhere with you...."
INGREDIENTS
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1 pound (about 2 large) zucchini or other summer squash, trimmed
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1 1/4 teaspoons fine sea or table salt, plus more if needed
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1 cup (3 ounces or 85 grams) coarsely grated gruyere cheese
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3/4 cup (2 1/2 ounces or 70 grams) coarsely grated fontina or provolone cheese
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1/4 cup (20 grams) finely grated parmesan or pecorino cheese
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Freshly ground black pepper
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8 thin slices bread of your choice, I used a country-style white bread
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A couple tablespoons softened butter or olive oil for brushing bread