Adding enough thickening agent to a jam is a quick way of making the delicious sweets that we call in France ‘pâtes de fruits’. Probably not a recipe for complete beginners, but still not very difficult.
Got there in the end. Instead of making a fully home-made tart I went to buy an uncooked pastry at the local supermarket, for this recipe to appeal to busy households. Quince glazing optional, can be replaced with something else.