Grouper Fillets With Ginger and Coconut Curry

grouper fillets (about 6 ounces each), skin removed

Kosher salt and black pepper

olive oil

spring onion (or the white portion of 1 large leek), trimmed, cut into 2-inch segments and julienned (about 1 cup)

minced fresh ginger

minced fresh turmeric or 1 teaspoon dried turmeric

small carrot, peeled and julienned

snow peas, julienned

fresh or frozen green peas

full-fat coconut milk

red curry paste, plus more if needed

cilantro leaves, for garnish