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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.
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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.
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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.
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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.
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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.