Heat the beans in their liquid either in the microwave or on the stove.
Drain the beans and put them in a bowl, reserving the liquid to add later.
Add the tomatoes, onion, garlic, parsley, lemon juice, olive oil, cumin and salt to the bowl with the beans. Mash the beans together with everything else until they are the consistency you want. The mixture will probably be quite thick, so add some of the cooking liquid from the beans until it reaches the consistency you want.
Adjust the seasonings to taste and then plate ful medames in a bowl, using a spoon to make some waves on the surface. Cover with more olive oil and serve with bread and pickled vegetables.