Bistec de hígado (liver steak)

Instructions

1. Remove the membranes from the liver, rinse it and pat it dry. Season it with salt, pepper and oregano.
2. Lightly coat the slices in flour.
3. Fry the sliced onions in the oil until well browned, about 10 minutes, then set them aside.
4. In the same very hot pan, sear the liver for 1 to 2 minutes per side: it should stay pink inside.
5. Return the onions, add the chopped garlic and the vinegar, and let it bubble for 1 minute, stirring.
6. Serve immediately, piping hot, with the rice and plantains.