Cut the red onion in half lengthwise. Remove the skin and slice each half into thin 1/2 moon slices. Slice capsicum into little finger sized strips. If using the meat, chop into 1 inch cubes and sprinkle with 1/4 teaspoon fine salt.

Heat a large frying pan on a high heat. Add a little oil and cook onion and capsicum for about 5 minutes or until they are starting to soften and brown a little. Stir every few minutes.

Add the meat or beans to the pan. Continue to cook on a high heat, stirring every few minutes until the meat is cooked through and browned or the beans are hot.

Remove the pan from the heat. Add lime juice and stir. Taste and season meat / beans with extra salt and possibly more lime. If using beans and the mixture looks a little dry, a good drizzle of peppery extra virgin olive oil (or avocado oil) will remedy things.

Serve the frying pan in the middle of the table with the lettuce / tortillas and hot sauce and let everyone make their own bites of deliciousness.