Cover the fava beans and chickpeas with water in a pot and heat over medium heat. You don't need to cook anything here - just make sure everything is nice and hot.
Squeeze the lemon.
Peel the garlic and crush it in a mortar with a little salt.
Mix the crushed garlic with the lemon juice and cumin in a bowl.
Chop the parsley and mint leaves. You can mix them together and put them in a small bowl.
Dice the tomatoes.
Put the beans and chickpeas with 1/4 of the liquid into the bowl with the garlic and mash coarsely with a potato masher.
Stir and season with salt and harissa. If the bean puree is too thick, you can stir in more of the liquid or a little water.
Divide the fuhl among 4 bowls, top with parsley, mint and diced tomatoes.
Pour plenty of olive oil over the fuhl.
Serve Fuhl Medammas still warm with pita bread, olives and pickled and fresh vegetables of your choice.