Spicy food? CHECK. Excellent taste? CHECK. Great service? CHECK. Affordable? CHECK.
That's the gist of it. I strongly suggest getting the dry versions of the food even if it is off-menu. Those taste better. The owner is warm and welcoming, and greets his regulars in person all the time.
Standard wise, this is the best Hakka restaurant in Mississauga, and I have tried the others. Note that it is debit and cash only.