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In a food processor, pulse the chorizo, sausagemeat, paprika, lime juice and coriander until well combined. Add the beans and some seasoning, and quickly pulse again to mix. Tip into a bowl and mix in just enough egg (about half) to bind. Shape into 2 fat burgers, cover and chill for 15 mins. Meanwhile, heat oven to 200C/180C fan/gas 6.
Heat the oil in a pan and fry the burgers for 3 mins on each side. Transfer to a baking sheet and cook in the oven for a further 10 mins until cooked through.
Serve the burgers in rolls with soured cream, avocado and rocket, with chips and lime wedges on the side, if you like.