Here's a chart on food that describes where to buy the, what their effect is, and their buy/sell.

Cherry Cluster- Effect-Restores HP, Magic +2
The Fields of Fum Shop 40/10

Fish- Effect- Restores HP, Strength +2
Alfitaria Shop 40/10

Gourd Potato- Effect- Restores HP, Defense +2
The Fields of Fum Shop 40/10

Meat- Effect- Restores HP, Strength +2
Alfitaria Shop 40/10

Rainbow Grapes- Effect-Restores HP, Magic +2
The Fields of Fum Shop 40/10

Round Corn- Effect- Restores HP, Defense +2
The Fields of Fum Shop 40/10

Star Carrot- Effect- Restores HP, Defense +2
The Fields of Fum Shop 40/10

Striped Apple- Effect-Restores HP, Magic +2
The Fields of Fum Shop 40/10