1. Combine fennel bulb, yogurt, fronds, vinegar, 1 teaspoon honey, and 1/4 teaspoon salt in a bowl, stirring with a whisk.
2. Preheat broiler to high.
3. Combine 1/4 teaspoon salt, panko, rind, and black pepper in a bowl. Heat oil and garlic in an ovenproof skillet 1 minute or until garlic is golden. Remove garlic from pan with a slotted spoon; discard. Add 2 teaspoons oil from pan to panko mixture; toss to coat.
4. Return pan to medium-high heat. Combine coriander, cumin, red pepper, and remaining 1/4 teaspoon salt in a bowl. Sprinkle one side of fillets with spice mixture. Add fillets, spice-side down, to remaining oil in pan; cook 3 minutes. Turn fillets; top evenly with panko mixture. Add lemon juice to pan. Place pan in oven; broil 90 seconds or until topping is golden and fillets are done. Serve with yogurt sauce.