Croissant Sandwich

Ingredients

• 4 ounces smoked salmon, cut into bite-size pieces
• 1 tablespoon finely chopped scallions
• 1⁄4 cup thinly sliced celery
• 2 tablespoons mayonnaise (regular or light)
• 1 tablespoon plain yogurt or sour cream
• 1 teaspoon lemon juice
• 2 teaspoons Dijon mustard
• 2 teaspoons finely chopped fresh dill
• Salt and freshly ground black pepper, to taste
• 1 croissant, halved lengthwise
• 3 to 4 thin slices cucumber, optional
• 2 to 3 thin slices avocado, optional