Line a baking sheet with parchment and set aside.
In a large cast iron skillet or heavy-bottom pan, stir together the 3/4 cup (150 grams) sugar, vanilla sugar, cinnamon, salt, and water over medium heat just until combined.
Once the mixture starts to bubble, stir in the almonds using a wooden spoon.
Cook at a simmer, stirring often, until the water evaporates and the sugar becomes powdery. Reduce heat to medium low.
Continue stirring often until the powdery sugar starts to melt into caramel and coat the almonds.
Stir in the remaining 1/4 cup (50 grams) sugar and cook, stirring, just until the almonds are coated in the shiny caramel with bits of the more rough sugar.
Immediately remove from heat and pour the mixture over the parchment-lined baking dish.
Use two forks or a wooden spoon to separate the almonds into a single layer before they start to cool. Do not touch the almonds with your hands. They will be very hot.
Once cooled to room temperature, store in an airtight container for up to a week or two.