Is the author of "Sushi, Anyone?" on the contract?
contract = 1 means on contract; contract = 0 means not on contract
SELECT T1.contract FROM authors AS T1 INNER JOIN titleauthor AS T2 ON T1.au_id = T2.au_id INNER JOIN titles AS T3 ON T2.title_id = T3.title_id WHERE T3.title = 'Sushi, Anyone?'