Combine Ingredients: Place the almond flour and powdered sugar in a food processor bowl. Blend these until they are thoroughly mixed, and the texture becomes fine.
Add Liquids: To the dry mix, add your chosen liquid (water or sweetener), almond extract, and optionally, rose water. Use short pulses with the food processor until the mix starts to gather together, eventually forming a cohesive ball.
Adjust Consistency: Examine the dough. If it appears too dry or doesn't hold together well, introduce a small additional amount of liquid, pulsing again to mix. The goal is to create a dough that's thick yet pliable. Should the dough feel overly sticky, you can correct this by mixing in a bit more almond flour until it feels right.
Knead the Dough: Take the marzipan dough out of the food processor. On a clean surface, knead it by hand for around 30 seconds. This step helps to achieve a uniform and smooth texture.
Shape and Chill: Shape the dough into a log form. Wrap this log tightly in cling wrap to protect it. Place the wrapped marzipan into the refrigerator. This chilling process helps the marzipan to firm up, making it easier to work with later on.
Storage: Keep the marzipan refrigerated. When made with agave syrup or corn syrup, it should remain good for 2-3 weeks, potentially even longer. If water was used, aim to consume it within 10 days. For extended storage, consider freezing the marzipan. Properly wrapped and frozen, it can last for up to 3 months.