Preheat the oven to 280C/350F/Gas 4 and line a muffin tin with cupcake cases.

Cream the margarine and caster sugar and then add the eggs one at a time beating after each one. Stir in the flour and salt.

Divide between the paper cases and bake for 15 minutes or until golden brown. Leave to cool on a wire rack.

When cooled completely remove the middle of the cupcakes. We used the OXO Good Grips Cupcake Corer for ease.

Add a teaspoon of jam to the middle of each cupcake, cut the removed cake in half and replace the top section, creating a lid.

Decorate the cupcakes using frosting/buttercream and sprinkles. I used ready made strawberry frosting and hearts to give a Valentines feel.