Grilled potato and watermelon salad

Ingredients

• 3 cups baby potatoes, grilled, cooled and cut in half
• 3 cups watermelon, cubed
• 1 cup cherry tomatoes, cut in half
• 1/2 red onion, thinly sliced
• 1 cup feta cheese, crumbled
• 1/4 cup mint, roughly chopped

For the dressing:

• 3 tablespoons sherry vinegar
• 1/2 lemon, juiced
• 1 teaspoon Dijon mustard
• 1/2 cup extra virgin olive oil
• Salt and pepper to taste