Step 1

Slice off each end of the watermelon, then stand it upright. Run a knife down the sides to remove the rind. Slice the flesh into 3/4-inch (roughly) slabs, then stack the slabs and slice into 3/4-inch strips and then 3/4-inch cubes. Transfer 3 quarts of the cubes to a large bowl. Store the remaining watermelon in the fridge.

Step 2

Place the cubes in a large bowl. Season with a large pinch of sea salt. Add 2 tablespoons each olive oil and aged balsamic vinegar. Toss gently to combine. Let stand for 5 minutes. The watermelon will begin releasing juices. You may find you have enough dressing with the 2 tablespoons each olive oil and balsamic. Taste a cube. If it needs more salt, olive oil, or balsamic add to taste.

Step 3

Gather your herbs. Slice the feta. Add to the bowl and toss to combine.  Finally, fold in the arugula. Crack pepper over the top if you wish. Serve immediately.