Hummus And Mint Veggie Burgers

Name: Hummus And Mint Veggie Burgers
Ingredients: 2 tablespoons flaxseeds, finely ground; 1 tablespoon fresh lemon juice; 1/4 cup almonds; Five 2-ounce hamburger buns; One 15-ounce can chickpeas, drained and rinsed; 1/2 cup pitted Spanish olives; 1/2 small zucchini, chopped (about 1 cup); 1/4 cup fresh mint, packed; 1/4 cup store-bought hummus, plus more for burger; 1/8 teaspoon cayenne pepper; Kosher salt and freshly ground black pepper; 2 tablespoons olive oil; Toppings: Sliced tomato, arugula, hummus