Without water there is no tea, without correct water temperature there will never be a good cup of tea. Too hot water is going to make your tea taste bitter, prevent the release of maximum aroma, flavors, and it will be unpleasant to drink. While black tea can deal with hot (close to boiling) temperatures, green teas are much more delicate.
Croissants, as we know them today, are made with less butter than their "ancestors". The fact remains that it is one of the major ingredients of the recipe. They go very well with black teaEnglish Breakfast.