Fresh Salmon Burgers with Tarragon Mayonnaise Recipe

Ingredients

• 1 pound skinless salmon fillet, cut into 1/4-inch pieces (about 2 1/4 cups)
• 4 green onions, chopped
• 1 tablespoon drained small capers
• 1 tablespoon fresh lemon juice
• 1 tablespoon chopped fresh tarragon or 1 teaspoon dried
• 1 teaspoon Dijon mustard
• 1 teaspoon prepared white horseradish
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 1/2 cup dry breadcrumbs
• 1 tablespoon butter
• 8 slices brioche loaf or egg bread, toasted
• 4 large tomato slices
• 8 radicchio leaves
• tarragon mayonaise