Combine raisins with water in a food processor and blend on high speed for about 1 minute or until very smooth.
Combine this raisin puree with the vegetable shortening, egg, brown sugar and vanilla in a large bowl. Mix well with electric mixer until smooth.
In a separate bowl, combine the flour with the oats, baking soda, cinnamon and salt. Pour this dry mixture into the wet mixture and mix well until ingredients are incorporated. Mix in raisins.
Roll 3 tablespoon portions of the dough into a ball in your hands and press to 1/2-inch flat on an ungreased baking sheet. Bake for 18-20 minutes. Be careful not to overcook, or the cookies will not be chewy. Store in a sealed container.