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1
With a sharp knife, gently score duck breast skin in a tight crosshatch pattern, keeping the scores 1/8 inch apart. If you prefer a little fat left on the breasts after cooking, just barely score the skin; to render more fat, score more deeply, taking care not to expose the flesh.
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2
Season duck breasts with salt, heavily on the skin side and lightly on the flesh side.
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3
Place duck breasts, skin side down, in a large, cold saute pan. Place pan over low to medium-low heat. To keep the edges from curling up, press duck breasts down with the help of a smaller saute pan. After about 5 minutes, the fat should begin to gently bubble. If the fat is either silent or spitting, adjust heat accordingly. Maintain the gentle bubble of fat, pouring out excess rendered fat throughout the cooking process, until much of the fat has rendered, skin is golden brown, and duck's internal temperature is 125u00b0F (52u00b0C), about 15 minutes.
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4
Increase heat to medium and further brown skin if needed, about 1 minute, before flipping and cooking on the flesh side. For medium-rare meat, cook until breast registers 130u00b0F (54u00b0C) on an instant-read thermometer, about 1 to 2 minutes. Continue cooking until duck registers 140u00b0F (60u00b0C) for medium or 155u00b0F (68u00b0F) for well-done. Remove duck from pan and set aside to rest.
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5
Over high heat, deglaze saute pan with white wine. Scrape up any brown bits stuck to pan and let wine reduce until pan is almost dry and only 1 to 2 tablespoons remain, about 2 minutes. Add chicken stock and let reduce by half, until sauce is sticky and rich, about 2 minutes. Remove sauce from heat and swirl in butter until melted and evenly incorporated. Season sauce with orange juice and zest, salt, and black pepper. Serve with duck breast.
