Heat 1 tablespoon of the olive oil in a medium saute pan over medium heat. When it is hot, add the onion and cook until soft and lightly caramelized, about 3 minutes. Add the garlic and cook until fragrant, about 30 seconds. Remove from the heat and set aside to cool.

Place the flour in a shallow bowl or plate, and stir in the Essence. Set aside.

In a medium mixing bowl, mash the black beans well with the back of a fork -- the mixture should be relatively smooth, with no whole beans remaining. Stir in the cooled onion mixture, cilantro, egg, salt, pepper, cumin, coriander, and hot sauce and mix well. Divide the mixture into 8 evenly sized patties (about 1/3 cup each).

Heat the remaining 6 tablespoons olive oil in a medium nonstick skillet over medium heat. When the oil is hot, dust the patties in the seasoned flour mixture and carefully transfer them to the hot skillet (the cakes will be delicate). Cook the cakes until golden brown on both sides and heated through, about 2 minutes per side.

If necessary, season with more salt. Garnish with chopped cilantro, and serve immediately.