Combine marinade well. Brush onto duck breasts then place skin side up in a dish, uncovered, in the fridge for at least 30 minutes.
Preheat the oven to 200C. On your stovetop, place 2 duck breasts, skin side down, in a large non stick pan over medium heat. Render for 6 minutes, moving and rendering the fat until the skin is golden. Repeat with remaining duck breasts.
Pop duck breasts skin side up on a lined oven tray and bake for 14 minutes (or until cooked to your liking), flipping halfway. Remove from the oven and let sit for 10 minutes, then thinly slice with a sharp knife.