But the messier condiment packets, like single-serve ketchup and mustard, are basically impossible to recycle, she explained, because they are contaminated by food. Since some restaurants started reopening in May, sales of single-serve condiments have increased up to 40% compared to last year, he said. Some restaurants needed more spice packets when they started selling more off-premise meals, which also contributed to the spike in demand. In the first half of the year, sales of single-serve condiments like mayo, ketchup and salad dressings grew by 300% compared to the same time last year, he noted. "We've seen an incredible, significant increase in [business to business] sales due to the unprecedented demand in the single-serve condiment packets," said David New, the company's CEO.