1. Heat a large skillet over medium-high heat. Add 2 teaspoons oil to pan; swirl to coat. Sprinkle fillets evenly with garam masala and 1/2 teaspoon salt. Add fillets to pan, skin side down. Cook 7 minutes; turn over, and cook 1 minute or until desired degree of doneness.
2. Combine remaining 2 1/2 teaspoons oil, remaining 1/8 teaspoon salt, yogurt, green onions, crème fraîche, and lime juice in a small bowl, stirring with a whisk. Serve yogurt mixture with fillets. Serve with lemon wedges.