We had Mustard's in Windsor Heights last night for supper. I heard they stole the Tavern's recipe - and I honestly like it better than the Tavern.
One thing to be aware of - A co-worker recently went there and ordered a medium pizza. When they got it, the bottom of the pizza was burnt. They mentioned it to one of the workers who was walking around and the worker said "oh, yeah, when you order a medium pizza, you need to remember to tell us not to leave it in too long or the pizza will burn." A little confused, they tried to eat what they could of the pizza, and mentioned it again to a different worker and got the same response. It's as if the cook couldnt' remember not to burn the pizza, so they expected the customer to remember it for them.
However, last night we ordered a medium and it came out just fine, so take it for what it's worth.