Blanch tripe in boiling water for 5 minutes, then drain and rinse well.
Place tripe in a large pot, cover with fresh water, and simmer covered 1 hour 30 minutes until tender.
Drain, cool slightly, and slice tripe into thin strips.
Melt butter in a large pot over medium heat. Add carrots, celery root, leek, and onion, cooking 8–10 minutes until softened.
Add broth, sliced tripe, marjoram, nutmeg, and ginger. Simmer 20–30 minutes.
Season with salt and pepper.
Serve hot, with grated Parmesan on top if desired.