Now, tuna from Boston and Canada in season, but not many. Onion called ‘Sapporo-Ki’ is also in season. At Sapporo Central Wholesale Market, tuna and onion are auctioned and inseason. It’s time to eat fresh onions, Ootoro or Chu-toro as fat part is so delicious that many sushi restaurants are going serve them as sushi. Onion soup, marinade, curry and so on. Enjoy them.