Fairy dust from Ophilia (the fairy), High quality meat from the buffet waitress, homemade condiments from Sandra (hot dog rival), fresh leaf greens from Diane (grocery store worker), flawless baked bread from donut baker. I forgot the last one, but I'm pretty sure the flavour enhancers came from Tiffany (the mad scientist). You get them all as rewards for progressing through their stories
Edit: just checked, you get the flavour enhancers for finishing Cici's quest