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.