Put the red wine, sliced garlic, rosemary and thyme in a bowl. Wash the liver under cold running water, pat dry. Cut into approx. 1.5 cm thick slices and place in the red wine for 2 hours.
Then remove from the red wine, pat dry and season with chili powder and pepper. Brush with olive oil and grill for 2 minutes on each side. Salt and serve after grilling.