2 tbsp olive oil

1 tbsp lemon juice

1 1/2 tsp dried oregano

1 zucchini, sliced into rounds

1 large red onion, cut into 1-inch pieces

1 red bell pepper, cut into 1-inch pieces

1 orange or yellow bell pepper, cut into 1-inch pieces

1 green bell pepper, cut into 1-inch pieces

Honey mustard or balsamic dressing for dipping