Place the onion and the cucumber in two separate bowls. Liberally sprinkle with sea salt and lime juice. This will require about 1 lime per bowl, depending on the juiciness of your limes. Let stand for at least 30 minutes.

In a large bowl, place the yogurt. Using your hands, squeeze the water out of the onion and the cucumber, and transfer to the bowl. Add the cilantro and season to taste with fresh lime juice and sea salt. You may also use the leftover liquid from the bowls to thin or season your raita. Mix well and serve alongside your favorite Indian dishes. Bon appétit!