I'm doing nearly the same exept without celery. I'll try to add it next time ! The 2 other changes that I'm doing are to replace the sugar with sliced apple for the sweetness (1/8 of apple per portion).
Also, adding blended cashew nuts (approx 30g per portion) improve a lot the texture and taste imho.
You could add some piece of ham/lard in the puree soup, and eat with bread or "crouton"