“one man’s trash is another man’s treasure.”

There is an old saying, “one man’s trash is another man’s treasure.” Over the centuries, food items have been assigned certain values that can change over time depending on availability or scarcity. Some herbs, spices and many other foods are much more costly today than they once were, due to demand and the perception of prestige. Alternatively, some ingredients that once were considered “treasures” are now cheap and easily found at a supermarket or specialty shop….
Pick an ingredient or food item that’s value has changed dramatically over time. Has it become more costly/luxurious/desirable? Or is it the other way around, mundane and easily acquired? Give background details about the ingredient and tell how it’s value has changed over time.