Pat the leg slices dry, cut into the silver skin all around (so that the meat does not bulge), season with salt, pepper and fry on both sides over medium heat until they get color.
Remove from pan and set aside
Sauté the onion and paprika, season with salt, pepper and add chilli or paprika to taste, stir and deglaze with red wine
Place leg slices on the vegetables, cover with the lid and simmer over low heat for 90 minutes.
After 60 minutes, turn the leg slices over, place the cucumber slices on the meat and braise with them