Caramelised red onion beef burger | Kikkoman

Ingredients

• 2 tbsp olive oil
• knob butter
• 2 large red onions, thinly sliced
• 2 tbsp soft light brown sugar
• 500 g good quality beef mince
• 2 tbsp finely chopped fresh parsley
• 2 tbsp finely chopped fresh thyme
• 8 tbsp Kikkoman Teriyaki Sauce with Roasted Garlic
• 1 small head radicchio, shredded
• 4 brioche burger buns, halved and cut side toasted
• 2 avocado’s, sliced