Grilled Portobello Mushroom Burger – Gewürzhaus

Ingredients

• 2 tbsp low sodium soy sauce
• 2 tbsp balsamic vinegar
• 2 tbsp olive oil
• 2 tbsp Gewürzhaus Melbourne Coffee Meat Rub
• 4 Portobello mushroom caps
• 4 Swiss cheese slices or vegan alternative
• 4 crusty burger rolls
• Approximatley 150b baby spinach
• 1 red onion, thinly sliced
• 1 tomato, sliced
• 1 avocado, sliced