Preheat oven to 350*
Add the raisins to a small bowl and pour the boiling water over it. Set aside to cool.
In another bowl whisk together the flour, baking soda, salt, and spices. Set aside.
Put the raisin mixture in the blender and add the molasses and corn syrup. Puree.
In another bowl, beat the butter and sugar, until fluffy.
Add the egg and vanilla, beat about 1 minute.
Add the raisin puree and beat to combine.
Add the flour mixture a little at a time, beating until well combined.
Stir in the oats.
Drop 1tbl. at a time onto a greased cookie sheet.
Bake until the edges are just beginning to brown, cool a few minutes, remove from the cookie sheet.
Cool completely before filling.
Add the salt to the hot water, and mix to dissolve.
Beat all other ingredients on high, until fluffy.
Add the cooled salt solution and mix.
Spread between cooled cookies.