I like some little chunks of fruit in my sauce, so I use a potato masher to get the berries crushed but not smooth. If you want your sauce smoother you can use an immersion blender or a regular blender. (If you use a regular blender be sure to remove the little square from the center of the top and cover with a towel before blending if it’s warm.) Also, if you want to strain out any seeds after blending, (I don’t), you can push the sauce through a fine mesh sieve.