Step 1: Toast the Bagels : Preheat a toaster or oven. Toast bagel halves until golden and slightly crisp. Optionally, brush with a small amount of butter or olive oil for extra flavor.
Step 2: Spread Cream Cheese : Evenly spread cream cheese on each bagel half. Make sure to cover the entire surface for a creamy base.
Step 3: Layer the Fillings : Place smoked salmon slices evenly over the cream cheese. Add cucumber and tomato slices. Sprinkle thinly sliced red onion and fresh arugula on top. Add optional toppings: capers, dill, a squeeze of lemon juice, and black pepper.
Step 4: Assemble the Sandwich : Place the top half of the bagel over the fillings. Press lightly to hold together.
Step 5: Serve : Serve immediately while the bagel is warm and crispy. Optionally, cut in half for easier handling.