Italian Coffee froth drink

Have just gained a brain wave,whilst thinking of turning my homemade Soda Bread with the Raisins in - into a Bread and Butter Pudding - was thinking of making a homemade Custard for soaking Buttered slices of Soda Bread in - and then later - baking in the oven.With the Egg White's was thinking of making a Italian Meringue,which involves adding a hot syrup of water and sugar (120 oC) too raw egg white's that might need too be whipped up first - my meat thermometer might be able too test the temperature of the hot Syrup. Am not sure if the Coffee froth drink should be cold,or hot - a milky Coffee should be made from very hot milk first - am not sure how much sugar too use - for the Syrup infused Meringue will already be very sweet.