Put the strawberries in a food processor or blender and blend until smooth (my Vitamix works great for this task). If needed, scrape down the sides and blend again. Once the strawberries are smooth pour the puree through a fine wire-mesh strainer into a 2 quart mixing bowl. To speed up the process use the back of a spoon to press the puree mixture through the strainer (be sure to get all of the puree off the bottom of the strainer as well.) Discard the solids.