Take one silver cocktail shaker, add a dollop of fresh tamarind purée, a quick squirt of Cointreau, and a gentle spray of fresh lime juice. Cover with a generous ounce and a half of Casa Noble reposado tequila and a scoop of cubed ice. Shake it hard. Dip the rim of a stout, stemless martini glass into a mixture of chile piquin and salt. If this combination of sweet, sour, hot, cold, and citrus was served at the United Nations, it could pave the way for world peace.