Cut off the end of the English cucumber, discard, then chop it into ¼ inch pieces.
Chop the tomatoes into ¼ inch pieces as well and discard as much seeds as you possibly can. The salad will not only last longer without them, but get soggy much later.
Peel and chop the red onion to ¼ inch pieces. Visually, you are aiming for 1 portion cucumbers, 1 portion tomatoes and ⅔ portion onions.
Mix all the ingredients in a bowl, adding half the lime juice, salt and pepper. Mix well refrigerate for 30 minutes until the tomatoes start juicing.
Mix well again, taste and adjust seasoning and sourness, adding more lime juice to taste.
If desired, sprinkle the dried mint on top or mix it in and enjoy.