1. Melt the butter in a medium-sized saucepan over low heat with the sugar, cinnamon, and water. Stir until the butter just melts but don’t allow it to boil: most of the sugar should not be dissolved.
2. Remove from heat and stir in the flour, baking soda, and almonds until well mixed.
3. Line a 9-inch (23cm) loaf pan with plastic wrap and press the dough into the pan so the top is smooth. Chill until firm.
4. To bake the cookies, preheat the oven to 325Fº (160ºC.)
5. Using a very sharp chef’s knife, slice the dough crosswise, as thin as possible, into rectangles. If you can get them as thin as a coin, all the better. The thinner they are, the more delicate and crisp they’ll be.
6. Space the cookies on parchment lined baking sheets and bake for 10-15 minutes, or until the cookies feel slightly firm and the undersides are golden brown. Flip the cookies over and bake an additional 10-15 minutes, until the cookies are crisp and deep golden-brown on top. The baking times depend on how thin you cut the cookies.
Cool completely, then store in an airtight bin until ready to serve.