Possible Clues:

• Prometheus dismissed sour dish made with fermented soya
• Plant-based protein
• Soy-based meat alternative
• Vegan's protein source
• Fermented soya beans
• Indonesian dish made by deep-frying fermented soya beans
• Indonesian soya dish; meet HP (anag.)
• Cryptic theme about source of protein in Indonesian food
• High-protein food made by incubating soya beans with a fungus
• Salad theme includes cored apple dish made with fermented soya