Preheat oven to 350°F. Toss broccoli with oil, salt and pepper together on a parchment paper lined baking sheet. Bake for 15-20 minutes or until tender and lightly golden brown.
Meanwhile, heat panini maker until hot and coat with olive oil cooking spray. In a small bowl, combine mayonnaise, hot sauce and lemon juice.
Slice Tribeca Oven Ciabatta Loaf in half lengthwise, and again into thirds. Spread mayonnaise mixture over each bottom slice. Top with onions and broccoli. Spread pesto over each top slice.
Working in batches, press sandwiches until heated through, about 4-5 minutes. Repeat with remaining sandwiches. Slice and serve.
Notes
Tip: Use a grill pan! Heat grill pan on medium heat and coat with olive oil cooking spray. Press sandwich with a heavy skillet or pan until sandwiches are heated through, about 4 to 5 minutes.