Several reasons:
**Quality Control:** This means many things: They only pick vegetables that fall within a certain range of characteristics. They adjust the formulation and/or process based on the available materials. And they constantly test during the process to make sure the final product is going to have the corrected taste.
**Law of averages.** You buy two tomatoes, one may be sweeter than the other, the other more acidic. But, when your recipe calls for 30,000 gallons of tomatoes it tends to average out.
**Specific suppliers:** You can always buy from a specific supplier that produces the vegetable to your specifications.
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