Place potato slices into a medium bowl. Drizzle 1 tablespoon olive oil and toss to coat.
Place slices onto a medium-high heated grill. Grill potatoes for about four minutes on each side until grill marks appear.
When slices are cooked, remove from heat and allow to cool.
Whisk together vinegar, remaining olive oil, parsley, red pepper flakes, ground mustard, salt and pepper. Stir in pepper rings, chopped tomatoes, olives and arugula. Set aside.
When potatoes have cooled, cut each slice into quarters and gently fold chunks into the vinegar mixture. Serve immediately.
Place potato slices into a medium bowl. Drizzle 1 tablespoon olive oil and toss to coat.
Place slices onto a medium-high heated grill. Grill potatoes for about four minutes on each side until grill marks appear.
When slices are cooked, remove from heat and allow to cool.
Whisk together vinegar, remaining olive oil, parsley, red pepper flakes, ground mustard, salt and pepper. Stir in pepper rings, chopped tomatoes, olives and arugula. Set aside.
When potatoes have cooled, cut each slice into quarters and gently fold chunks into the vinegar mixture. Serve immediately.