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Ingredients 1 Egg 1 Tbsp Water 1 tsp Soy Sauce 1 tsp Worcestershire Sauce 2 Tbsp Tomato Sauce 1 tsp Whole Grain Mustard 2 Tbsp Bread Crumbs 500g Lean Mince Hamburger Buns 1 Large Onion, finely chopped 1 Tbsp … Continue reading