1. Place a 1-oz shot glass on a saucer, then fill the glass with equal amount of peach schnapps and Midori melon liqueur. Across the rim of the glass, place a slice of lime and sprinkle with caster sugar. Pour sambuca over the lime so it flows onto the saucer. Ignite the lime and the liquor on the saucer.
2. To drink, either wait till the flame goes out, or blow it out if you could. Drink from the shot glass, pour the liquor on the saucer into the glass, drink, then suck on the lime.