Mezcal Sour
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1½ oz. fresh lime juice
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1½ oz. Mezcal
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1 oz. Amaro Montenegro
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1 tsp. light agave nectar
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1 large egg white
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Angostura bitters and lime twist (for serving)
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Shake lime juice, mezcal, amaro, agave, and egg white in a cocktail shaker (or in a tightly lidded 1-qt. glass jar) until frothy, about 1 minute. Fill shaker with ice, cover, and shake again until outside is frosty, about 30 seconds. Strain through a fine-mesh sieve into a coupe glass. Garnish with a few drops of Angostura bitters (drag a toothpick through drops to create a swirly pattern if you wish). Top with lime twist.