Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make crispy apple tart [title] Make the apple filling. [step] Place a wide saucepan on a medium heat and put in the diced apples, along with the sugar. Heat and stir until they start to break down.

Ending1: You'll know the sugar is almost gone when you stop stirring. [title] Pour the softened butter into the bowl. Ending2: Check periodically to make sure it's almost strong. [substeps] If needed, stir in a little more sugar. Ending3: You can mash them with the back of the spoon to help the consistency break down. [title] Keep stirring until most of the liquid has evaporated. Ending4: [title] Cook the apple tart crust for 3 minutes. [step] You want the crust to be thick enough to mold to the side of the pan where the apples would sit.

Answer format: ending1/ending2/ending3/ending4