Spanish omelette would be adventurous for me. I've never made one.
For Cuban Black Bean Soup, you buy a bag of black beans (sometime called Turtle Beans.) The night before you plan to make them you put them in a big heavy pot and cover them in water, maybe two or three times as much water as beans. The next morning the beans will have absorbed much of the water. Add more water again so that the beans are completely covered. To the beans and water add:
-half and onion (chop up the other half and set it aside.)
-half a bell pepper (chop up the other half and set it aside, I think red ones taste best.)
-a bay leaf, some cumin and some oregano.
-a clove or two of garlic
-some olive oil (or whatever oil you have.)
-If you have some fresh coriander add that, don't bother to chop it up.
Let the beans gently bubble for as many hours at it takes for them to soften, this could be 3 to 6 hours. Only add as much salt as you desire for flavour, once the beans have already gone soft (if you add the salt early on it makes the beans tough - I don't know why.)
Once the beans are soft, fry two to four chopped up rashers of streaky bacon in a small skillet with a little more olive oil (you can be generous, remember beans are completely fat free.) Then add the half a chopped onion and bell pepper that you have saved from before along with some minced garlic. You have just made a "sofrito."
Take the half an onion, pepper, bay leaf, and any corriander out of the pot of beans and throw them away. Add your sofrito to the pot.
Serve over plain white rice. It is traditional to garnish with chopped coriander and a dollop of sour cream.
Beans and rice heat up well in the microwave. The beans should keep in the fridge for about three days. BTW this is sometimes called Moros, short for Moros y Cristos. Meaning Moores and Christians in Spanish. I think they call it this because the beans are black (representing the Moores and the Rice is white representing the Christians.)
If you have a lot of this left over and are getting bored you can easily turn it into Gaillo Pinto (or painted rooster.) This is a dish my Costa Rican step mum makes a lot. You fry a few extra chopped onions and garlic in a skillet in some olive oil and then add in the rice and beans. The bean juice coats the rice and the whole concoction tastes divine. Served with a fried egg on top it is a reasonable dinner.
I hope I haven't made this all sound to complicated because it is not. Also, if you don't have every last ingredient, don't worry, you can leave out a spice/herb here or there or make substitutions and it will still be good.