Melt margarine in a small nonstick skillet over medium-high heat. Add onion and liver; cook 1 minute. Add wine; bring to a boil. Cover, reduce heat, and cook 2 minutes. Remove from heat; cool slightly.
Place liver mixture, duck meat, and next 5 ingredients (duck meat through pepper) in a food processor; process until smooth, scraping sides of processor bowl occasionally. Spoon mixture into a small bowl; cover and chill. Sprinkle with pistachios just before serving. Serve with crackers.