I moved away from Calgary 3 years ago now but every time I come back for a visit, a mushroom pizza from Una is a must! I've tried mushroom/fungi pizzas from various restaurants in Edmonton and Calgary and hands down, Una's is the best! They put a good amount of toppings on the pizza and the arugula, truffle oil and mushroom pairing is so addictive and amazing. I have even had my sister bring Una to Edmonton for me. Their kale Caesar salad and peanut chocolate dessert is also delicious.
I would say the only downside to Una is that the venue is quite small and they are almost always busy - meaning no reservations and usually a wait between 30mins to over an hour but they let you have wine while you wait so that's a plus.