De-seed the watermelon cut into cubes and chill in the fridge.
Halve or quarter the tomatoes (depending on their size), remove the seeds and pulp and chill in the fridge.
Wash and dry the mint leaves.
To make the dressing, place 4 cherry tomatoes, garlic and a pinch of salt in a mortar and pulverise till you have a juicy pulp.
Put the tomato pulp, extra-virgin olive oil, lemon juice, cumin powder, paprika, ground pepper, chopped coriander and a little more salt in a bowl and whisk to blend. Set aside.
Put the cold watermelon and tomato in a large bowl, pour most of the dressing over and gently toss. Transfer to the serving bowl / platter, scatter the mint leaves over the salad and drizzle the remaining dressing over.