Soy Scotch Eggs with Onion relish

Ingredients

• 4 eggs, hard boiled
• 375 g pack sausagemeat
• 6 spring onions, finely chopped
• 2 tsp Kikkoman Naturally Brewed Soy Sauce
• 2 1/2 tsp wholegrain mustard
• 1 egg, beaten
• 3 1/2 tbsp plain flour
• 100 g Kikkoman Panko - Japanese style crispy bread crumbs
• 500 ml vegetable oil to fry
• Knob of butter
• 1 tbsp olive oil
• 2 large onions, finely sliced
• 2 tsp sugar