Soak raisins in wine for 1-2 hours
Pull butter & eggs from fridge, bring them to room temperature
Drain raisins & set aside soaking wine
Pre-heat oven to 375'F
Cream margarine & sugar
Add eggs, 3 tbsp reserved wine, mix until blended
On low speed, slowly mix in flour, baking powder & salt
Stir in raisins
Lightly flour work surface
Turn out dough, it will be very soft
Divide dough into 3 equal pieces, form into loaves
Transfer loaves onto parchment lined baking sheet, about 3 inches apart
Brush tops with reserve wine & sprinkle with sugar
Discard reserve wine
Bake 20-25 minutes or until tops are golden brown
Remove from oven, gently remove from baking sheet & cool on wire rack
Slice loaves into biscotti shape pieces, place back on cookie sheet, cut side up
Bake 15-20 minutes or until golden brown
Store in an airtight container