The broth tries to be a crafting ingredient and a comestible at the same time. Balancing it properly can’t be done just by adjusting the nutrition.
The best way would probably be to make the recipe create 2 or 4 doses of broth and cost variable number of ingredients rather than the current 1 of anything. An egg (~40 nutrition) should produce more broth than cooked dandelion (12 nutrition?).