Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper to prevent sticking.
In a mixing bowl, combine graham cracker crumbs, granulated sugar, and salt, then whisk together until evenly distributed.
Add the melted butter and freshly grated lime zest to the dry mixture, then stir until the mixture looks cohesive and sandy in texture.
Gradually add the flour to the wet mixture, folding with a spatula until a smooth, firm dough forms that can be pressed together.
Divide the dough into small portions and roll each into a thin, even sheet on a lightly floured surface, aiming for about 1/8 inch thickness.
Cut the rolled dough into small rectangles or circles, then transfer gently onto the prepared baking sheet.
Bake in the preheated oven for 10-12 minutes, or until the edges are just golden and the surface is crackly and slightly puffed.
Remove the baking sheet from the oven and let the cookies cool on a wire rack until crisp and firm to the touch.
Once cooled, serve these thin, crispy cookies as a tangy citrus treat or use them to garnish desserts for a crunchy flavor boost.
