Spicy Watermelon and Pickled red onion Salad

INGREDIENTS

1/3 cup

apple cider vinegar

1/3 cup

water

1/4 tsp

kosher salt

1/2

medium white onion, very thinly sliced ((about 1 cup))

2 tbsp

extra virgin olive oil

2 tbsp

champagne vinegar

1/2 tsp

dijon mustard

1/4 tsp

kosher salt

small pinch of black pepper

1 cup

baby arugula

4 cups

watermelon, cut into 1/2 inch cubes

1/2

large jalapeno, very thinly sliced