Start by washing the cucumber and watermelon thoroughly. For the cucumber, slice it thinly using a sharp knife to ensure even pieces that will provide a nice crunch.

Cut the watermelon into bite-sized cubes, removing any seeds if present. This will add a sweet and juicy element to the salad.

Finely dice the red bell pepper and thinly slice the red onion. These will add color and a slight crunch to the salad.

Chop the fresh cilantro and set aside. This herb will add a fresh flavor that complements the other ingredients.

In a mixing bowl, combine the soy sauce, rice vinegar, sesame oil, honey, fresh lime juice, and red pepper flakes. Whisk together until the honey is fully dissolved and the dressing is well combined.

Taste the dressing and adjust the sweetness or acidity according to your preference by adding more honey or lime juice.

In a large serving bowl, combine the sliced cucumber, cubed watermelon, diced red bell pepper, sliced red onion, and chopped cilantro.

Drizzle the dressing over the salad and gently toss everything together to ensure the ingredients are evenly coated. Be careful not to mash the watermelon.

Top the salad with chopped peanuts for an added crunch and serve immediately for the best texture.