Actually, Xia Yu would say, "sourdough" is the very thing he relies on to fear no "toxic milk."
What, you ask about the "Four Divine Seafood Eight Treasure Soul Suppressing Dumplings" recipe?
You must know that "sourdough" is an indispensable ingredient for crafting this golden recipe. Seriously, a Soul Suppressing Bun without "sourdough" is doomed to be incomplete.
If Xia Yu stubbornly pointed to a few seafood-filled buns and proclaimed them to be the sublime essence of the Bai Luo Family's secret techniques, Logan, the king of pastries, would probably be so furious he'd kick the lid off his coffin and leap out to curse at him, pointing to his nose.
Which came first, the ingredients or the recipe? This would lead to a philosophical problem akin to the chicken and the egg. At this moment, Xia Yu was busy kneading dough, who had time to ponder such profound philosophical questions?