Combine coconut milk, chiles, ginger, garlic, soy sauce, lime juice and brown sugar in a medium bowl. Add shrimp and toss to coat. Cover and marinate in the refrigerator for 10 to 15 minutes, tossing occasionally. Drain well, reserving marinade.

Heat oil in a large nonstick skillet over medium-high heat. Add shrimp and cook, turning once, until barely pink, about 30 seconds per side; transfer to a plate. Add tomato and spinach to the pan; cook, stirring, until the spinach starts to wilt, about 30 seconds. Add the reserved marinade; simmer until the sauce thickens slightly, about 2 minutes. Return the shrimp and any accumulated juices to the pan; heat through. Serve immediately.

Freeze any leftover coconut milk or refrigerate it for several days; you can use it instead of broth or water to cook rice or enrich a curry or rice pudding (visit www.eatingwell.com for recipe suggestions).

Cooking with frozen shrimp: Individually quick-frozen shrimp, sold in resealable bags, are convenient to keep in your freezer. Thaw in a covered bowl in the refrigerator. If you're in a hurry, place shrimp in a colander under cold running water for about 5 minutes.