Step 1
Process the parsley and garlic in a food processor until finely chopped. Add the pepitas and process until combined. Add 2 tablespoons of the oil. Process to combine. Season. Stir in lemon juice.
Step 2
Heat half the remaining oil in a large frying pan over medium-high heat. Cook the fish for 2-3 mins each side or until cooked to your liking. Transfer to a plate. Cover loosely with foil and set aside for 2 mins to rest.
Step 3
Meanwhile, holding the lemon over a bowl to catch any juice, cut along either side of the white membrane to remove the segments. Combine lemon segments and juice, fennel, spinach, tomato, onion and remaining oil in the bowl. Season. Serve with fish and pesto.