Yes to Yeast Foam!
What would you buy from the Firnbach & Raupp General Store?
Yeast was a popular item purchased at the Firnbach & Raupp General Store. In addition to regular yeast, the store sold a manufactured product called Yeast Foam. Yeast Foam was often purchased with other baking items, like how Bernard Weidner purchased it with butter and cornstarch. Yeast Foam was used in baking, but also as a health supplement.