Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: Give the color of the grape whose wine products have the highest average price? | grapes : id , grape , color | appellations : no , appelation , county , state , area , isava | wine : no , grape , winery , appelation , state , name , year , price , score , cases , drink | wine.appelation = appellations.appelation | wine.grape = grapes.grape | 

### Response:

select _ from _ group by _ order by avg ( _ ) desc limit _ | select grapes.color from grapes join wine on grapes.grape = wine.grape group by wine.grape order by avg ( price ) desc limit 1