Step 1

Preheat oven to 425° and line a rimmed baking pan with parchment paper; set aside. Heat 2 tbsp. oil in a large frying pan over medium heat. Add garlic clove and cook until lightly browned, about 2 minutes; remove garlic and reserve.

Step 2

Pulse bread pieces in a food processor until coarse crumbs form. Add crumbs to frying pan (don't wipe out bowl of processor) with 1/4 tsp. each salt and pepper and cook, stirring, until crunchy and lightly golden, about 3 minutes. Remove from heat and set aside.

Step 3

Put sage, reserved garlic clove, and lemon zest in food processor and pulse until well chopped. Add the pumpkin seeds and salt to taste and pulse until coarsely chopped.

Step 4

Cut fish down the center to create 4 fillets. Rub each with scant 1 tsp. of remaining oil and season with salt and pepper. Place fillets on prepared baking pan and roast until fish starts to turn opaque, about 5 minutes.

Step 5

Sprinkle bread crumbs over fish. Roast until crumbs are browned and fish is cooked through, about 5 minutes more. Transfer to plates, sprinkle with gremolata, and serve with lemon wedges and green salad.