2: Put 400 g minced beef in a bowl, salt and pepper lightly, then add 1 tablespoon chilli spices, the chopped onion and the coarsely chopped parsley. Mix well.
3: Shape the mixture into patties with your hands. Set aside.
4: Put 300 g tinned red kidney beans into a bowl. Salt and pepper.
5: Crush the beans roughly with a fork.
6: Mould into patties. It is easiest if you shape them in small dessert rings.
7: Transfer the bean patties onto a sheet of cooking parchment to wait.
8:
Cooking
Fry 4 slices smoked ham on both sides in a frying pan on high heat. Transfer to a plate.
9: Pour 2 tablespoons oil into the same pan, and when really hot, cook the beef patties to your preferred level. Set aside to keep hot.
10: Still using the same pan, lightly fry the bean patties on both sides. Take care, as these are tricky to handle and turn over. Use a fish slice or broad spatula if possible. Leave to wait in the pan, off the heat.
12: If possible, lightly toast the bottom halves in a toaster and put the top halves to warm over it in the rising heat.
13: Sit the bottom halves on the serving plates.
14: Spread a little mustard and sit a hot beef patty on top, then a few flakes of cheddar, cut with a vegetable peeler.
15: Sit the red bean patty on top with a slice of fried ham.
16: Add a couple of lettuce leaves and the top of the bun, with a second dash of mustard if you like. Should be eaten right away.
Remarks
There are lots of ways to vary this basic idea, still in keeping with the Mexican spirit: bacon instead of ham, a different cheese, a dash of Tabasco or lime juice on the bean patty, add a little avocado, etc. Just let your imagination and preferences guide you. If you are fortunate enough to be in Brest, France, trot along to the remarkable "Pen ar bread" bakery in Guipavas, run by Sébastien and Audrey. I recommend it wholeheartedly (Brittany's best bakery in 2019). Here you'll find a whole range of delicious burger buns, like the ones shown in the photos. The owner is a really nice guy and a fount of knowledge about the science of baking, and happy to talk about it.