Dirk ,
Be carefull blending hot base sauce with a hand blender , I did some a few weeks ago 8ltrs ;D and I had about a cupfull of boiling hot base fly out of the pot all over my bare arm and some on the missu's back

I also had some ' mush ' on the bottom of the pot but just kept blending until smooth but you need to rest the blender quite often .
A jug blender makes a better job of blending but can be messy transferring from pot to blender.
Buy a jug blender then reblend your remaining portions.