Set oven to 375 degrees.

In a mixing bowl, cream butter and sugar.

Add in the eggs, beating well after each addition.

Beat in molasses and sour cream.

Combine flour, ginger, baking soda, allspice, cinnamon and nutmeg; gradually add to the creamed mixture.

Stir in raisins and walnuts.

Drop by tablespoons (1-inch apart) on greased cookie sheets.

Bake for 10-12 minutes, or until edges begin to brown.

Remove to wire racks; cool.