Instructions: You can find taco shells in most supermarkets these days-Mexican food is increasingly popular, because its both tasty and quick to make.

Preheat the oven to 325 degrees.

To make the sauce, finely chop the onions, drain and finely chop the chilies. Peel and chop the tomatoes, then mix the onions, chilies and tomatoes with the lemon juice in a mixing bowl.

Heat the oil in a pan, add the beans and cook gently for 4-5 minutes, then mash roughly with a fork. Place the taco shells in the oven until they are warm, approximately 3 minutes.

Spoon the beans into the hot taco shells. Top with the lettuce, grated cheese, and a spoonful of sauce. Serve immediately.

20 minutes to make

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