Step 1

Pulse shallot in a food processor until finely chopped, about 12 pulses. Add salmon; pulse until mixture is finely chopped, 8 to 10 pulses. Transfer half of the mixture (3/4 cup) to a large bowl, and set aside. Add mayonnaise, sour cream, cream cheese, lemon zest, and lemon juice to remaining salmon in food processor; process until mixture is smooth and creamy, about 20 seconds, stopping occasionally to scrape down sides of bowl.

Step 2

Transfer creamy salmon mixture to finely chopped salmon mixture in large bowl. Add chives, dill, and capers; gently fold ingredients together until incorporated. Season to taste with salt and pepper. Transfer dip to a serving bowl. Garnish with additional chives and dill. Serve.