Put the tongues in cold water, let them boil, pour away the water and rinse the tongues well, peel the onion.
Repeatedly place the tongues with the whole onion in enough cold water to just cover them. Boil for 1-2 hours until soft (until skin can be easily peeled off): Make a medium-thick sauce with 2 tases of this clear soup and the flour, butter and cream.
Saw coconuts exactly in half and cut away enough of each side so that the halves stand as a shell. Stir the coconut milk (the coconut water!) with the sauce and add the cooked leftover meat.
Fill the coconut halves with the mixture and exactly in each half put a tongue and on top a chili pepper form. Cover with aluminum foil. Form the coconut halves in a baking dish covered with a little water and leave it in the oven at medium heat for 45 minutes.
Before serving, remove the foil and garnish the shells with mint leaves. It is important that the tongue protrudes from the liquid and has not been split in any way due to carelessness. This would be taken as a very bad omen.