Cut the watermelon into large cubes. Thinly slice the cucumbers.
Supreme the orange, but keep the remaining pith.
To make the dressing, add all the ingredients to a bowl. For the orange juice, squeeze the juice out of the remaining pith. Whisk until well combined.
Assemble the watermelon, cucumbers, and oranges on a plate.
Spoon the dressing over everything on the plate. Top with pecans and plenty of tajin and salt.
Enjoy immediately or store in the fridge until serving.