Apple tarte tatin

For this I read a few recipes online and then kind of made it up. I made this a little while ago and have forgotten exactly what I did! (We moved house recently which has wiped my brain clean.) I was aiming for a vegan version of my mother-in-law’s recipe: the apple slices are pre-steamed to soften them up, I remember that much. I melted vegan margarine and stirred in some brown sugar. I think I just poured this mixture over the apple slices (artfully arranged at the bottom of the pie dish), then put some puff pastry on top (store bought, vegan). Then I put it in the oven at some temperature (moderate?) for some time (20 mins? longer?). Although I’ve forgotten all the technical details, I do remember that it tasted very good with soy icecream.