These incredibly light and moreish biscuits are made by sandwiching buttery almond biscuits with redcurrant jelly. Enjoy with a big mug of tea, coffee or hot chocolate.
Press hard-boiled egg yolks though a fine sieve. Mix with 80g caster sugar. Add vanilla sugar, salt and sieved flour. Knead everything together. Wrap in foil and chill for 2 hours.
In a bowl, mix together almonds and 100g sugar. Set aside.
Preheat oven to 200 C / Gas 4.
Roll dough out to 4mm thickness and cut in 5cm rings. Brush one side of the rings with beaten egg yolks, then dip into almond-sugar mixture.
Place the rings with almond side up on a baking tray. Bake in the centre of the oven for 10-15 minutes.
Remove the baked rings from the baking tray and leave to cool. Brush the bottoms with redcurrant jelly and press two rings together. Dust with the remaining caster sugar.