I only used 1 1/2 tablespoons of lemon juice, but feel free to adjust it to your liking. The actual recipe calls for 3 tablespoons, but I figured you can always add more but can't take out if you put in too much. I suggest you start with one tablespoon and taste it and then add according to your taste buds.
I also stirred in about another 1/2 to 3/4 cup of chicken broth just before serving. It had thickened up quite a bit and I wanted it just slightly thinner.
One more thing, I threw in an extra carrot because mine weren't super big.