Grate the lime and beat the egg yolks until frothy.
Mix coconut milk, flour, corn starch and butter in a saucepan and heat while stirring so that the mixture thickens. Turn off the stove and stir in the lime zest. Then stir in the frothy egg yolks. Bring everything to the boil over low heat, remove from heat and let cool down completely.
Beat egg white and sugar until stiff and fold into the cooled mixture.
Grease the soufflé molds with butter and sprinkle with sugar. Spoon the dough into the molds and bake at 180 ° C for 10 minutes.