Grandma's bean soup!

Soak the beans overnight adding a tsp of baking soda to the water.

Start cooking in the morning. Let the beans boil for a while and discard the first water.

Place the beans once more in the pot and add boiling water so that they boil faster. When they start to get tender add the rest of the ingredients, leaving the tomato, the tomato paste and the lemon juice towards the end.