If you’re looking for the Loomi Cart on (most) Thursdays at Bumbo’s Bar in Hamtramck, it’s not hard to miss. Just walk outside to the patio where chef Andrew Stevick is getting the coals hot inside of a shopping cart that he’s rigged into a grill. It’s one of the most bizarre set-ups I’ve seen, but instantly makes Stevick’s pop-up a visually intriguing one. The food follows suit. Chicken mole tamales at Loomi Cart. Stevick’s cooking is colorf…