Wash and dry the pumpkin. Then cut a piece, remove the fibers and seeds. Peel the skin off (lay the piece on a cutting board and peel downward) and chop it into a few centimeters big, similarly sized pieces.

Blanch the lemon briefly.

Cut 3 slices from the lemon, and squeeze the juice from the rest.

Pour about 0.5 liters of water into a pot along with the lemon juice. Add the lemon slices, sweetener, and a pinch of cinnamon.

Pour into a glass and consume either warm or cold.