I went with the single for $3.89.
The defining bourbon-flavored sauce was really sweet, just a little tangy, and just ever so slightly spicy. To make sure you get the flavor, they spread it on the top and bottom bun of the burger. It ends up being pretty excessive and covering up a lot of the other ingredients. I'd prefer it on either the top or bottom bun, but not both.
The lettuce and tomatoes were pretty fresh and the bun was solid.
Overall, I mostly liked Carl's Jr.'s Jim Beam Bourbon Burger save for its defining flavor; there was way too much Jim Beam bourbon sauce and it was really sweet with the way it was spread on the burger.
Nutritional Info - Carl's Jr. Jim Beam Bourbon Burger - Single (296g)
Calories - 770 (from Fat - 310)
Fat - 34g (Saturated Fat - 12g)
Sodium - 1350mg
Carbs - 85g (Sugar - 33g)
Protein - 32g