In a small, non-reactive pan over medium heat, bring half-and-half to just under a boil while stirring constantly. Remove from heat and stir in tea extract; cool.
In a separate non-reactive pan, heat whipping cream, 2 tablespoons sugar, vanilla bean and salt over medium heat, stirring constantly until just under a boil; cool. Scrape seeds from vanilla bean into cream; discard vanilla pod.
In a medium bowl, whisk egg yolks with 1 tablespoon sugar until sugar is dissolved. Slowly whisk in cooled half-and-half and cream mixtures. Strain through a fine mesh sieve or cheesecloth.
Divide custard between 4 to 6 8-ounce custard cups. Arrange dishes in a baking pan. Place pan on center rack in preheated 275 F oven. Carefully pour hot water into pan to cover halfway up the sides of dishes. Bake until custard sets (about 40-45 minutes). Remove custard dishes from water bath; allow to cool slightly. Cover with plastic wrap; refrigerate at least 4 hours.
Just before serving, sprinkle 1 1/2 teaspoons sugar on each custard. Using a kitchen blowtorch, caramelize the tops.
Tip: You can also brown the sugar in a preheated broiler, carefully turning to avoid hot spots.