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Mission flour tortillas have 11 ingredients. A tortilla needs 4, flour, water, fat and salt. The bag lists enriched bleached flour, water, vegetable shortening made from interesterified and hydrogenated soybean oils, then 2% or less of salt, sugar, baking soda, sodium acid pyrophosphate, distilled monoglycerides, fumaric acid, calcium propionate and sorbic acid. The shortening is soybean oil that was hardened in a reactor so it acts like lard at room temperature. Baking soda and sodium acid pyrophosphate are a baking powder split in two, so the tortilla puffs on the hot plate in the plant. Distilled monoglycerides are an emulsifier. They keep the starch from going stale and hard, which is why a Mission tortilla is still soft weeks after you bought it. Fumaric acid drops the pH, and calcium propionate and sorbic acid stop mold in a bag that isn't refrigerated.