Minecraft wiki entry for Hunger_management, associated text: Advantages:
Flowers and mushrooms are easy to find.
Restore 7.2 saturation.
It's equivalent to a mushroom stew, but with an extra status effect depending on the flower used. Even with the flower, it can still be crafted in the player's inventory.
When crafted with blue orchid or dandelion, suspicious stew grants the effect Saturation for 7‌[JE only]/6‌[BE only] ticks (0.35/0.3 seconds), meaning an additional 7 () hunger and 14 saturation, for a total of 13 ( × 6.5) hunger and 21.2 saturation. While some of the saturation will likely be wasted, especially if the player was too hungry to begin with, the stew will at least raise the saturation to match the hunger gauge.
As long as the player has 7 () hunger, eating a single bowl of saturation suspicious stew will raise both hunger and saturation to full.
When crafted with an oxeye daisy, it gives 8‌[JE only]/6‌[BE only] seconds of Regeneration instead, which heals , making it all but essential when /gamerule naturalRegeneration is turned off.
Suspicious stew can also be made by using a flower and then a bowl on a brown mooshroom.
Suspicious stew can be purchased from farmer villagers.
When crafted with an azure bluet, it gives 8 seconds of blindness, the only way to get this effect in survival mode, and is required for the How Did We Get Here? advancement.