I ended up trying what Brotzeit Go has for the current "circuit breaker" season because I stumbled upon their advertisement by chance and saw that there's a bunch of stuff they didn't have previously. Perhaps these were designed for easy takeaway consumption since it was mostly their burgers and fladen. In fact, the only food item that wasn't those was their pork knuckle.
There was a pork knuckle fladen. It's not bad. Caramelized onions, cheese and a drizzle of sweet balsamic vinegar to cut through the fat. Came with a nice beery sauce. If there was anything I didn't really like about it, it'd be that this might have been better if you ate at the restaurant so that the fat from the knuckle was warmer, softer and the rind would be more crisp rather than hard.
Tried a porky cheeseburger because it was a pork burger - something a lot less common than it sounded. Patty was pretty salty, dry and mostly flavoured with rosemary. Bread added to the dryness. Good thing there was the sauce from the fladen.