Boil the beets, cut into quarters, in 2 liters (about 8 1/2 cups) of water. Keep until the water cools. (Do not discard the beets)

Chop all the fruit into cubes, slice the bananas, and cut the lettuce into strips. Set aside.

Once the beet water is cool, blend it with the beets, strain, and pour into another container with 3 liters (about 12 3/4 cups) of water.

Add the chopped fruit to the beet water and add 2 to 4 liters (about 8 1/2 to 17 cups) more water, depending on your preference.

Add sugar to taste. Serve very cold, preferably keeping the water refrigerated as long as possible before serving, or add ice cubes if needed.