Fridge (or as one mod added - serving table)
Keeps the food from spoiling (or slows down decay significantly)
Don't know how it would be possible, a place like equipment rack for meals is easy but how fast it spoils depends on the Def of the meal:
<ThingDef ParentName="MealBase">
<defName>MealFine</defName>
<label>Fine meal</label>
<description>A complex dish assembed with care from a wide selection of ingredients.</description>
<texturePath>Things/Item/Meal/Fine</texturePath>
<food>
<quality>MealFine</quality>
<nutrition>90</nutrition>
<eatenDirectThought>AteFineMeal</eatenDirectThought>
<eatEffect>EatVegetarian</eatEffect>
<ticksBeforeSpoil>80000</ticksBeforeSpoil> <<<it is the indicated
<soundEat>Meal_Eat</soundEat> time before the
</food> meal disappears.
</ThingDef>
You can change this value if you wish, (Rimworld#/Mods/Core/Defs/ThingDefs/Items_Meals.xml)
but for another item to change the meal's value...
Maybe if the 'fridge' would destroy the item and create a similar with different a value...
I don't think it's the "cheapest" idea. ^^
Nearly forgot: My idea (for now) would be a temporary "raid rebalance" "solution" against the 300+ raids late-games: A 3x3 super mega ultimate deathstructor turret (or something similar, you could always change the name if you want to ;3 ) that would be extra expensive and draw a lotta power (thus mostly usable late-game) but would have long range and could kill a few in a shot.
Easier than re-balancing everything, isn't it? No? Okay.