@gbkburgers have come a long way in the last few years in terms of being vegan-friendly.
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We used to order the Hippy Dippy burger and the delicious coconut mango dairy-free shake which has disappeared from the menu (bring it back) but now they have 2 vegan burgers. On the left is the Jack-in-a-Bun and on the right is the Californian π₯. We had corn on the cob without butter too.
Have you tried either of these? This was the Brent Cross branch π