Pour <quantity>30<unit>ml</unit></quantity> of gin, <quantity>30<unit>ml</unit></quantity> of Campari and <quantity>30<unit>ml</unit></quantity> of sweet vermouth to a mixing glass

Peel off <quantity>1<unit>strip</unit></quantity> of an orange

Slice it in a long diamond shape

Cut lengthwise from the center of the peel in each direction, leaving it in one piece. Twist two sides of the peel

Add ice to the mixing glass and stir for 30s

Strain into a glass with <quantity>1</quantity> clear ice

Decorate your drink with the orange peel. The negroni is ready. Enjoy!