Place the water on the stove and bring it to a boil. Once boiling, add the lentils and salt. Allow them to cook for approximately 10 to 15 minutes. Remove from heat, drain, and let them cool.
Meanwhile, finely chop the cucumber, tomato, onion, mango, and parsley.
Prepare the vinaigrette by combining all the specified ingredients, including finely chopped garlic.
In a mixing bowl or baking dish, combine the cooked lentils and the chopped vegetables. Pour the prepared vinaigrette over the mixture and gently stir to combine.