Green tea is made from the leaves of the Camellia sinensis plant. The leaves are picked and then quickly heated to prevent oxidation. This gives green tea its characteristic green color and fresh, grassy flavor. To make green tea from fresh leaves: Start by boiling water and then let the water cool for a minute or two. Place the leaves in a teapot or teacup and pour the hot water over them. Steep the tea for 2-3 minutes, then remove the leaves and enjoy.