Cream butter and brown sugar until fluffy. Add salt,baking soda, cinnamon, allspice, buttermilk and eggs; beat well. Stir in flour, oats, nuts and coconut. Drop by rounded tablespoonfuls onto ungreased cookie sheet. Bake at 375 degrees for 10 to 12 minutes. Frost if desired
To make the frosting,Brown butter in saucepan. Stir in confectioner's sugar and vanilla. Blend in milk until of spreading consistency.