You can't miss the orange shape building on Decarie Street. This place served the delicious orange drink, it is literally famous for their secret ingredient. The food and desserts menu isn't so bad either.
In the early morning to lunchtime, there isn't much of a lineup. Come evening, the lineup can be pretty long. About 10 to 15 minutes of wait time.
Overall, the drink is worth the wait. I wouldn't pass up the street without buying a Julep drink. It is the iconic drink of Julep.