Combine pesto and mayonnaise in a small bowl. Cover and refrigerate. Combine egg, breadcrumbs, carrots and pepper in a large bowl. Add veal and mix well. Shape mixture into four patties. Spray a grilling rack with nonstick cooking spray. Grill patties until done, about 8 minutes on each side. Add Texas toast to grill for the last 4 minutes of grilling. Grill until lightly browned, turning once. Serve, placing a patty on top of each slice of toast. Serve with pesto mixture.