Beat the margarine, caster sugar and vanilla extract together in a bowl until light and creamy.
100 g vegan margarine, 60 g caster sugar, 1/2 tsp vanilla extract
Add 140g of the flour to the bowl with the margarine, a little at a time, and mix together until combined.
140-150 g plain flour
Knead the dough briefly to ensure it comes together into a smooth ball.
If the dough is too dry and doesn’t come together, add 1/2 tsp of dairy free milk (or water) and try again. If the dough is too wet and sticks to your fingers when you try to bring it together, add a teaspoon (5g) more flour, briefly knead it in and then try again.
Flatten the ball of dough slightly, cover it with a re-usable wrap or cling film and place it in the fridge for 30 minutes to chill.
Line 2 baking trays with non-stick baking paper.
Roll the chilled dough out on a lightly floured surface to 3mm thick. Cut out 16 x 6cm circles to form the lids and bases of your biscuits. Place 8 circles on one tray and 8 on the other.
Using a knife or cutter, cut out heart shaped holes from the centre of 8 of the dough circles to form the lids. Leave the other 8 circles whole. Please see the recipe video for a demonstration.
Refrigerate both trays of uncooked biscuits for a further 30 minutes. There is no need to cover the trays.
Preheat the oven to 160°C fan (180°C conventional / 350°F / gas mark 4).
Bake both trays of biscuits for 12 minutes until the biscuits are just starting to lightly colour. You want them to be a light creamy shortbread colour rather than golden.
Cool the biscuits on the trays for a few minutes and then transfer them to a cooling rack.
Once they are cool, place 3/4 - 1 tsp of jam on each of the biscuit bases (the circles that don’t have a heart shape cut out).
8 tsp seedless raspberry jam
Place the lids (the biscuits with the heart cut out) on a board or plate and dust them lightly with icing sugar.
1 tsp icing sugar
Place the lids on top of the bases to sandwich in the jam.