Cream together the butter, sugar and maple syrup. Sift together the flour and salt and fold it into the batter. Stir in the walnuts, wrap in plastic and refrigerate for a half hour.
Roll the dough out on parchment paper, cut with a maple leaf (or other) cutter but leave the cookie in place and just peel the dough away from the sides. You can keep the cookies pretty close together because this dough will not spread in the oven. Sprinkle the top of the cookies with the tablespoon of sugar and bake in a pre-heated 350 degree oven for approximately 16 minutes. The cookie edges will be light brown but the cookie itself will still be soft. Remove from the oven and let rest on the baking sheet for a few minutes until the cookies harden a bit. Transfer them to a wire rack to finish cooling.
To make the glaze, whisk together the melted butter, confectioner's sugar, maple syrup and salt. Drizzle over cooled cookies, if desired.
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