Pyruvate scale

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The pyruvate scale measures pungency in onions and garlic with units of μmol/g_fw (micromoles per gram fresh weight).^[1] It is named after pyruvic acid, the alpha-keto acid co-product created in the biochemical pathway that forms syn-propanethial-S-oxide, the main lachrymatory agent in onions.

The standard onion^[which?] has an eight rating, while "sweet onions" have a two or three rating on the scale. The lower the score or scale the more "sweet" the onions are rated. Anything less than five is considered a sweet onion. The Vidalia onion variety is considered sweet and must have a score of 5.0 μmol/g_fw or less.^{[citation needed]} The HoneySweet brand onion is claimed to consistently rate with a pungency level of 3.5 or less.^[2]

The Supasweet onion (usually grown in Lincolnshire, England) registers 1.5 to 2 on the scale.^{[citation needed]}

Soil type, rain, and sunlight affect the pungency in onions and garlic and, therefore, their score on the pyruvate scale.

• Scoville scale – Scale for measuring spiciness of peppers

• The National Organic Program — by the USDA^{[failed verification]}

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