Burger (lamb): Lamb & Feta

Ingredients

• ½ of a large cucumber, peeled, sliced in half lengthways and deseeded
• 1 cup full-fat Greek yogurt
• 1 teaspoon white wine vinegar
• 1 teaspoon dried dill (or 1 tbsp chopped fresh dill)
• 1 small clove of garlic, peeled and minced
• ½ teaspoon sugar
• pinch of salt
• 5 ounces crumbled feta
• 1 heaped tablespoon chopped parsley
• 1 pound lamb mince
• 1 red onion — slice a few rings for topping off your burgers, finely chop the rest
• 2 heaped tablespoons panko breadcrumbs
• 1 egg
• 1 clove garlic, peeled and minced
• ½ teaspoon cumin
• ½ tablespoon Worcestershire sauce
• 1 ½ tablespoon olive oil
• pinch of salt and pepper
• 4 burger rolls
• large handful of baby spinach
• reserved onions rings (from above)