Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What date did the episode air when guy grossi won?

### Inputs:
table_name: table, columns: ['Episode', 'Airdate', 'Iron Chef', 'Challenger', 'Theme Ingredient', 'Winner']

### Response:
SELECT Airdate FROM table WHERE Winner = Guy Grossi