HI. I HAVE A RECIPE THAT REQUIRES LEMON ZEST. I COULD NOT FIND THIS AT THE GROCERY STORE IN OUR COMMUNITY. I AM ASSUMING THAT LEMON ZEST IS THE GRATE OF A LEMON. IS THIS CORRECT? ALSO, IF THE RECIPE CALLS FOR 1 LEMON ZEST, WHAT WOULD THAT EQUAL TO? A TSP, TBS, A WHOLE LEMON? ANY HELP ON THIS WOULD BE VERY MUCH APPRECIATED! THANKS.