I’ve tried Matcha, I think it is good if you sweeten it but not great otherwise
As for the lemon, I stop eating at 5 (or try to) but I am up until all hours. I have been losing weight as a result (about 20 lbs or more since July). There are some nights where I get bored with water or seltzer and I have started taking organic lemon in hot water. I usually have two large cups using the same lemon (I save a little bit of the lemon to add to the second cup). Then after I am done I will eat the lemon. For some reason being in the hot water makes it almost sweet. It is 5 carbs although probably not all at once (it takes me about an hour between both cups). I am not usually in ketosis anyway for various reasons but the lemon does not seem to be impeding my weight loss