1. In a bowl, add all the ingredient A and knead them well to combine evenly by hand.
2. Heat the vegetable oil in a fry pan, and shape the portion with your hands into a patty about 8 cm in diameter. Place the patty onto the pan over medium-high heat. Cook both sides until lightly browned. Then simmer (for about 15 mins) with a lid over gentle heat.
3. Transfer the burger to the plate. Wipe out the frying pan to get rid of any scorch mark and add all the sauce ingredient. Bring it to a boil, remove from the heat.