Mushroom burger with onion rings

1 pack Mushroom Patties 4 onions sliced into rings 200 ml beer175 g plain flour1⁄2 teaspoon baking powder Flaked saltPepper1 litre frying oil 200 grams brown field mushrooms Dried thymeSaltPepper 2 red onions100 ml pickling vinegar 100 ml sugar (about 80 g) Lemon juice Mayonnaise Tomatoes Lettuce What to do: Onion rings Mix the flour, […]