Collect grey tickets from duels or from group goals and exchange once a week for premium box tickets in chef duel shop.It is a bit of lottery,you can also get pink tickets.I was rewarded by one gold ticket a few times. Also if you are keen on duels try to complete group goal "use 12 boosts in chef duels".It is a chance to get gold ticket out of reward box as well.
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Also if you are keen on duels try to complete group goal "use 12 boosts in chef duels".It is a chance to get gold ticket out of reward box as well.