Chorizo sandwich with grilled vegetables

Ingredients

• 75 ml (5 tbsp) olive oil, divided
• 1 green zucchini, cut diagonally into 8 slices
• 1 whole red pepper
• 1 small eggplant cut into ½ in. slices
• 45 ml (3 tbsp) fresh basil leaves, chiffonade
• 80 ml (1/3 cup) or more store-bought, to taste
• Zest from ½ a lemon
• 10 ml (2 tsp) lemon juice, divided
• 8 slices specialty bread (sourdough, for example)
• 500 ml (2 cups) fresh arugula
• 20 slices Fantino & Mondello chorizo
• Salt, to taste
• Freshly ground pepper