Wrap six 2-ounce ramekins with parchment, extending 1-inch above rim. Secure with tape; set aside. Stir boiling water and tea in a bowl. Refrigerate 30 minutes.
Put sugar, egg yolks, and tea mixture into the bowl of an electric mixer set over a pan of simmering water. Whisk until lightened and fluffy, about 8 minutes. Attach bowl to mixer fitted with the whisk attachment; beat on medium speed until cool, about 5 minutes. Transfer to a bowl.
Put cream and creme de menthe into the clean bowl of an electric mixer fitted with the whisk attachment, and beat on medium-high until stiff peaks form. Fold into yolk-tea mixture. Divide among prepared ramekins. Freeze at least 4 hours (up to overnight). Remove parchment. Let stand at room temperature 10 minutes before serving. Serve dusted with tea.