Preheat the oven to 300 °F/150 °C without fan.
Place a bowl over a saucepan of simmering water (or use a double boiler), ensuring the bottom of the bowl doesn't touch the water. This method ensures gentle, indirect heat for cooking.
Constantly whisk the granulated sugar, egg whites, pinch of salt and lemon juice in a bain-marie until the sugar dissolves and the mixture becomes sticky.
Remove the mixture from the heat. Fold in the almond meal and almond flour until well combined.
Pipe the batter in 2 inch circles at a 90 degree angle on the baking sheet lined with parchment paper or silicone baking mat, leaving space between each cookie.
Place a raw almond on top of half of the cookies.
Bake in a preheated oven for 22-24 minutes, or until the cookies are lightly golden brown and almost set. Keep an eye on them to avoid over-browning.
Once baked, remove from the oven and sandwich one cookie with an almond on top with one without. They will stick together easily while still warm.
Allow to cool completely before serving.
Enjoy your delicious Acıbadem cookies!