Question: Which wine products have the highest average price? | Do you mean which grape whose wine products has the highest average price? | Yes, Which grapes are in the wine products that have the highest average price?
SQL: SELECT T1.grape FROM GRAPES AS T1 JOIN WINE AS T2 ON T1.Grape   =   T2.Grape GROUP BY T2.Grape ORDER BY AVG ( Price )  DESC LIMIT 1