NOT KNOWN FACTUAL STATEMENTS ABOUT HERO BURGERS OFFERS

Checked the nutritional details on their website. Apparently the 4oz soul burger patty has 18 grams of protein as well as 4 oz frequent burger patty has sixteen oz of protein. Curious what the primary source of protein is. It has soy but don’t know if that’s the key component.The supply is limited to 1 for each customer and might’t be coupled