What is "seasoning tub"

Seasoning \Sea"son*ing\, n.

1. The act or process by which anything is seasoned.

2. That which is added to any species of food, to give it a higher relish, as salt, spices, etc.; a condiment.

3. Hence, something added to enhance enjoyment or relieve dullness; as, wit is the seasoning of conversation.

   Political speculations are of so dry and austere a nature, that they will not go down with the public without frequent seasonings.
   --Addison.

   Seasoning tub (Bakery), a trough in which dough is set to rise.
   --Knight.