Wash and peel fresh mangos: cut each into 6 slices. Place in chafillg dish or skillet. Pour orange juice over fruit and sprinkle with sugar. Heat to simmering stirrlng gently to dissolve sugar and coat fruit. After 3 or 4 minutes. Pour tequila: keep over medium heat. Flame sauce by pouring a little tequila into teaspoon and holding it over flame of chafing dish or range until it flames: then use this flaming tequila to light tequila on top of mangos. Serve over vanilla ice cream.