Sliced foods sell rather fast also. I just recently put the extra sliced foods I made from fighting oslya raptors on my alt to sell. So far I've made about 11k in less than 10 hours :D

btw I usually sell heal items at a 1/10 gold/HP-SP ratio. And you're really selling cheap if you're selling your syrups for only 15 gold O_o

Apple Syrups and Grape Syrups sell the fastest I believe. Mages buy the Grape, Warriors buy the apple.