Oven-cooked sardines - a popular fish in Spain, especially in summer, when they are readily available, they can also be cooked under a grill or on a barbecue, in which case, toss the sardines in the bowl before cooking.

Spread the sliced onions and the bay leaves in the bottom of an oven-proof dish and lay the sardines on top.
Mix the rest of the ingredients in a bowl and pour over the sardines.
Cook in a pre-heated oven until golden-brown and beginning to turn crispy.
Serve with the lemon wedges and drizzled with olive oil.
4 servings