Chicken pate

Ingredients

• 2 teaspoons parsley, flat leafed
• 1 teaspoon tarragon, fresh
• 1 red onion, 2 inch piece
• 5 oz cooked chicken
• 1 teaspoon lemon zest
• 1 teaspoon lemon juice
• 6 tablespoons unsalted butter
• 1 teaspoon salt
• 1 teaspoon ground black pepper