Sprinkle fish with 3/4 teaspoon curry powder, 3/8 teaspoon salt, and 1/8 teaspoon black pepper.

Heat a large nonstick skillet over medium-high heat. Add oil to pan; swirl to coat. Add fish; cook 4 minutes or until deeply browned on bottom but undercooked on top (fish will finish cooking later in sauce). Remove fish from pan.

Add onion and bell pepper to pan; sauté 4 minutes or until tender. Add ginger and garlic; sauté 1 minute. Add remaining 3/4 teaspoon curry powder, remaining 3/8 teaspoon salt, remaining 1/8 teaspoon black pepper, tomato, and lemon juice. Reduce heat to medium-low, and cook 10 minutes or until tomato breaks down, stirring occasionally. Mash tomato with a wooden spoon.

Stir in coconut milk. Return fish along with accumulated juices to pan, browned side up. Reduce heat to low; cover and cook 8 minutes or until fish flakes easily when tested with a fork. Cut fish into 4 equal portions. Spoon sauce into individual, shallow bowls; top each with a piece of fish. Serve with lemon wedges and chopped fresh cilantro, if desired.