Peel and finely dice the shallot. Clean, wash and chop the peppers. Celery clean, wash and cut into very fine strips. Heat oil in a pot and fry shallots until translucent.
Add the paprika and celery and sauté briefly. Deglaze with stock, bring to the boil, add pasta and cook for about 9 minutes. In the meantime wash parsley, dab dry and chop finely. Clean the mushrooms, wash if necessary and slice very finely.
Season soup with salt and pepper. Add mushrooms and parsley. Serve in deep plates garnished with marjoram if desired.