Was greeted and seated promptly.
Didn't know dim sum was served here, so we were pleasantly surprised to see the dim sum on wheel carts while following the hostess to our table. (Today is Sunday, so I am not sure if dim sum is available on just Sundays, on both Saturday and Sunday, or every day).
The staff is very attentive and friendly. The suggestions our waitress recommended were on point. Well, except for the papaya salad, which lacked the kick that most papaya salads have. Barely tasted the fish sauce or lime in it.
Loved the sea bass, the marinated fried squid. If you're in the Aria and you're craving Asian / Thai'ish (yes, I said "ish") food, Lemongrass is definitely worth checking out. Pricing is also reasonable. My party of 3 ate 4 selections of dim sum, sea bass, marinated fried squid, papaya salad, brown rice, and we also drank 2 Thai teas and 1 fresh-cocunut juice for a total of $103 pre-tip. More importantly, we were FULL AND SATISFIED. Worth coming back to try out more of what their menu offers.