Crumble the dry baked pate sablé and speculoos into coarse crumbs. Melt the butter and white chocolate, combine. Spread the cookie crumble in 6 tart molds, covered with baking paper. Push well. Leave for 1 hour in the refrigerator.
Soften the crema cheese with the sifted icing sugar and lime. Dry mix the remaining sugar with the cornstarch and add to the mixture. Pour in the eggs step by step and then the liquid cream until smooth. Portion in the tarts. Bake at 155°C during 75 minutes.