I remember reading somewhere about a magic jar that produced an inexhaustible supply of spices that magically made anything cooked with them taste fantastic. It didn't change the mechanical effects of eating the food: poisons would still be poisonous, magic food would still have its effect, rations would still work normally, they'd all just taste better. I think the book it was in was for 3.5, but references from either 3.0, 3.5, or Pathfinder will work. I don't even much care if its the same item I read about before, so long as the functionality and fluff are fairly close.
2 Answers
The Spice Jar from the Ferun setting is close to what you describe. It does however provide some bonuses aside from good tasting food.
A Pathfinder solution could easily be created using Wonderous Items rules. With DM approval any item can be created.
This item would likely be a continuous prestidigitation effect. Which by the magic item GP value estimation chart means it would cost Spell Level (prestidigitation is level 0 so this would be ½) × Caster Level (1) × 2000 which would make this item cost a low 1000 gold.
I used Prestidigitation because one of the abilities it has is:
It can chill, warm, or flavor 1 pound of nonliving material
The item could easily be fluffed as producing a powder that flavors food to perfection.
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2\$\begingroup\$ As Avestron noted in the comments, if you limit the effect to flavoring food, you could easily argue a more potent effect than prestidigitation normally offers. \$\endgroup\$ Commented Oct 29, 2014 at 19:28
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\$\begingroup\$ Since Prestidigitation does a lot of things, and this item would be using only one single effect from those, I would also reduce the price by half. (ok, or what @DavidWilkins suggested) \$\endgroup\$– o0'.Commented Jul 23, 2015 at 15:20
From Dragon #73, for AD&D 2nd Edition:
Pan of Spicing
A 9-inch, round iron pan with the runic "S" embossed on the handle. Any food fried in this pan is magically spiced to the cook's taste—quite a boon in areas where spice is scarce.