Before starting this Apricot Tarte Tatin recipe, organise all the necessary ingredients. Prepare the puff pastry and refrigerate for at least 30 minutes. Melt the butter in a tarte tatin pan placed on the stove. Add the castor sugar... ... and combine with a rubber spatula... ... until a caramel forms. Don't wait until the caramel turns dark, which will give it a bitter taste. ...