Cut the watermelon in half and scoop out the flesh into a large glass bowl. I used an ice cream scoop for this process. Once you have removed all of the watermelon flesh and have only the rind left, pour out any juices remaining. Use a paper towel or clean kitchen towel and pat dry the inside of the watermelon rind. Don’t throw these away! Set aside the watermelon halves to use as salad serving bowls.
Wash, pat dry and chop the arugula.
Dice the feta as needed.
Add the arugula and feta to the glass bowl with the watermelon.
Pour in the vinaigrette dressing into the bowl.
Gently toss the ingredients to combine.
Serve by spooning the salad mixture into the watermelon rinds.
Wash, pat dry then roughly chop the cilantro.
Garnish with plenty of fresh cilantro.