30ml Tequila (why did the Mexican throw his wife off the bridge?)
15ml fresh lime juice (sure, use the bottled stuff but you can tell the difference)
30ml Cointreau or Triple Sec
salt for glass rim
Rub rim of glass with lime slice, then dip in salt to coat the rim. Pour all ingredients into shaker, shake, then strain into serving glass. I use wide rimmed Margarita glasses but a champagne saucer would do. Garnish with lime slice. And yes, I know...I know, you just wanna kick back, glass in hand and SING ALONG TO THIS...