If making your own pastry. Do this first by using either a food processor, or your fingertips to rub together the flour and butter until the mixture resembles breadcrumbs. Gradually add in the water until a dough forms. Chill until ready to use.
Preheat the oven to 190C/170C Fan/Gas 5. Prep a 12 hole muffin tin by spritzing with oil/brushing with butter.
Combine the egg, coconut, sugar, vanilla and melted butter (ensuring it has cooled a little) in a small bowl.
Roll the pastry to 1/2 inch thick, and cut out rings using a cookie cutter (3.5 inch diameter). Place into the muffin holes.
Add about 1/2 tsp jam into each pastry case. Spread evenly before adding about 1/2 - 1 tbsp of the coconut filling to each.
Bake for approx 20 minutes, until the tops of the coconut filling are golden brown and the pastry looks cooked. Let cool on a wire rack before using a knife to slide the tarts out and serving (the filling will stay warm for a while).