Grilled Mushroom And Beef Burger | Donna Hay

Ingredients

• extra virgin olive oil, for brushing
• 8 large portobello mushrooms, stems trimmed
• 350g haloumi, cut into 4 slices
• 2 medium green tomatoes, sliced
• 2 large dill pickles, sliced
• 2 cups watercress sprigs
• store-bought tzatziki, to serve
• 500g lean beef mince
• 1 tablespoon dried mint leaves
• ½ teaspoon dried chilli flakes
• 1 clove garlic, crushed
• ¼ cup (40g) pine nuts, toasted and roughly chopped
• sea salt and cracked black pepper