1. Preheat your grill to medium-high heat.
2. In a blender, combine roasted red peppers, toasted almonds, garlic, red wine vinegar, olive oil, smoked paprika, salt, and pepper. Blend until smooth to make the Romesco sauce.
3. Grill the zucchini, red bell pepper, and eggplant slices until tender and slightly charred, about 3-4 minutes per side.
4. Toast the ciabatta rolls on the grill for about 1-2 minutes, until lightly crispy.
5. Spread a generous amount of Romesco sauce on the bottom half of each ciabatta roll.
6. Layer the grilled vegetables on top of the sauce, then add a handful of arugula.
7. Top with the other half of the ciabatta roll and serve immediately.