INGREDIENTS
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150 g extra-virgin olive oil
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900 g shell-on jumbo shrimp (16 to 20 per pound), peeled, deveined, and cut into 1-inch pieces, shells reserved and chopped coarse
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3,600 g water
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450 g spaghetti
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18 g plus 3 g kosher salt, divided
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30 g garlic (6 cloves), chopped fine
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2 g red pepper flakes
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18 g fresh parsley, chopped fine
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15 g lemon juice