Make This Pork Meatball Melt With Pickled Fennel

Ingredients

• 2 tablespoons olive oil
• 1/2 onion
• 1 garlic clove
• 9 ounces minced (ground) pork
• 1 tablespoon worcestershire sauce
• 1 ounce Parmesan cheese
• freshly ground black pepper
• 1 tablespoon fennel seeds
• 4 thick slices white bread
• 2 tablespoons butter
• 2 tablespoons rice vinegar
• 2 tablespoons runny honey
• 1 small fennel
• Scant 1/2 cup walnut halves
• 1 ounce basil leaves
• 1 tablespoon grated Parmesan
• 4 tablespoons olive oil
• Pinch sea salt