1 lb. shrimp shells (5 cups), plus 1 lb. medium shrimp, peeled, deveined, and butterflied, divided
One 2-oz. piece ginger, bruised and coarsely chopped (¾ cup)
1 medium stalk of lemongrass, bruised and thinly sliced (⅓ cup)
1 habanero chile, quartered
3 oz. tomato paste
4 cups full-fat coconut milk (32 oz.)
1 Tbsp. finely grated orange zest
2 tsp. finely grated lemon zest
1 tsp. finely grated lime zest
¼ cup thinly sliced scallions
Kosher salt
1½ lb. fresh spaghetti (or substitute 1 lb. dried spaghetti), boiled in a pot of salted water until halfway cooked, then drained and rinsed in cool water, cooking water reserved
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