Masala chai buttercream

• 1 3/4 cups sugar
• 5 large egg whites
• 6 pinch of kosher salt
• 5 sticks unsalted butter, cut into tablespoons, room temperature
• 2 teaspoon chai concentrate

Directions

• Bring a saucepan filled with about 2 inches of water to a simmer. Meanwhile, combine sugar, egg whites, and salt in a large heatproof mixing bowl. Set bowl over (not in) pan of simmering water and whisk until whites are warm to the touch and sugar has dissolved, 2 to 3 minutes. (Test by rubbing between your fingers; mixture should feel smooth.)
• Attach bowl to mixer fitted with the whisk attachment; beat on medium-high speed until stiff, glossy peaks form and mixture has cooled completely, about 12 minutes.
• Reduce speed to medium-low; add butter, 2 tablespoons at a time, beating to incorporate fully after each addition. (Don't worry if buttercream appears curdled at this point; it will become perfectly smooth again with continued beating.) Beat in chai concentrate.
• Switch to paddle attachment and beat on lowest speed to remove air bubbles, 3 to 5 minutes. If using buttercream the same day, cover bowl with plastic wrap and let stand at room temperature until ready to use.
• If not using the same day, transfer buttercream to an airtight container and refrigerate up to 3 days. Before using, bring to room temperature, then beat with paddle attachment on lowest speed until smooth and pliable, about 10 minutes.