Beef and porcini burger with truffle mayo and crispy onion rings recipe | Sainsbury`s Magazine

Ingredients

• 20g dried porcini 1 mushrooms
• 1 x 500g pack Taste the Difference 12% fat beef mince
• 1 shallot, finely chopped
• 1 tbsp finely chopped 2 rosemary
• 1 tbsp olive oil, to cook
• 200g frozen Taste the Difference beer battered onion rings
• 1 tbsp truffle oil
• 100g mayonnaise
• soft butter, to spread
• 4 brioche burger buns
• handful of salad leaves