Heat up the olive oil in a heavy bottomed pot over medium-high heat - I use my Le Creuset. Sauté the shallots, Serrano, roasted garlic, oregano, and salt for 5 minutes - or until the shallots and pepper are softened.
Add the legumes, tomatoes and water, and cook for another 10 minutes, or until the black-eyed peas are hot.
Heat the cooking oil in a large sauté pan over medium-high heat, and sauté the potatoes until they begin to crisp - about 7 minutes. Pour out all the oil leaving 1 tablespoon in the pan. Add the sherry vinegar and the frisée. Swish around the pan until wilted.
Melt the butter in a skillet for frying eggs over medium heat. Break open the eggs into the pan and flip after about 1 1/2 minutes. Cook to the amount of doneness desired.
To assemble: lay one-fourth of the fried potatoes on a plate and top with one small frisée head. Spoon one-fourth of the beans over the frisée, and top with the egg. Serve warm.