Butter Boom Croissanterie is a patisserie at Shed 3, 401 Grey Street, Hamilton East, Hamilton 3216, rated 4.9 on Google. Its listing describes it as devoted to the croissant, with products made by hand. It is open Wednesday to Sunday from 8am to 3pm, unless it sells out first. Croissants are best eaten on the day they are baked, and small bakeries often sell out early, so arriving soon after opening gives the best choice. Ask what fillings are available that morning, since flavours can change. Handmade laminated pastry needs time to rest and bake, so expect a short wait at busy times. For visitors to Hamilton East, Butter Boom at the Made Sheds on Grey Street is a good stop for a morning croissant near the Waikato River.