Herman ze German, Soho
Honestly the most delicious yet simple thing I've eaten. They do a must eat veggie wurst. It's gluten and lactose free. It's very popular on the weekends. Get a blonde beer, is so light and delicious. The sausage itself has a delicious flavour, it satisfying and substantial. I get it in a bun, but they do in a box with salad. You must must must add the curry tomato sauce, crispy onions, and the jalapeños and it's delicious. The pomes special, basically chips and curry sauce + mayo is also something I could eat all day given the chance. Prices are reasonable, good for groups with large tables downstairs. There are a few in the central London area, all the same menu, but with a slightly different atmosphere - this Soho one is funky and lively.