Steep loose tea in milk overnight (at least 8 hours), then strain out the loose tea.
Heat milk and butter to steaming (not quite to a boil). Pour hot milk over chocolate and stir until smooth. You may need to place the bowl over simmering water (like a double boiler), stirring until all lumps are gone and mixture is silky smooth.
Cool in bowl in the refrigerator until firm.
Form into small balls of chocolate, then roll in cocoa powder, crushed nuts, etc. Place in covered container and chill until ready to eat.
Assam Chocolate Truffles from https://www.adventureswithtea.com/assam-chocolate-truffles/