In a medium-sized bowl, whisk the butter and sugar until creamy. Add the egg yolks, vanilla sugar, and grated rind (peel) of lemon and combine.
100 g butter, 50 g sugar, 2 small egg yolks, 1 teaspoon vanilla sugar, grated peel (rind) of one lemon
Gradually add and mix in the all-purpose flour, scraping the bowl accordingly, if necessary. Add a pinch of salt and combine until you obtain a smooth and homogenous dough. Allow the dough to chill in the fridge for at least 30 minutes.
180 g all-purpose flour, pinch of salt
Scoop the dough into small balls (about the size of a tablespoon) and roll them into smooth balls between the palms of your hands.
Line two baking trays with parchment paper and preheat the oven to 375°F. Place the rolled dough balls on the trays then press your thumb or the back of a spoon on the center of each cookie, to create a hole.
Bake the cookies, one sheet at a time, for 11-12 minutes or until the edges start to turn brown. Once done, remove the tray from the oven, and allow the cookies to cool completely before filling them.
In a small bowl, prepare the filling by combining jam and the lemon juice.
3-5 tablespoon jam or marmalade, 1 tablespoon lemon juice
Using a teaspoon, fill the cookies with the jam filling (see notes). Dust the Engelsaugen with powdered sugar, then serve or store them in airtight cookie jars.
3 tablespoon powdered sugar