Blood Orange Margarita

Just got back from 8 days in Mexico and I'm still craving Margaritas.  I had a couple of blood oranges sitting around that inspired this cocktail a few weeks  back.  I welcomed my husband home from work one day with this and you should have seen his smile.

2 oz tequila (100% agave is the best)
1 oz fresh lime juice
1 oz fresh blood orange juice
1/2 - 1 oz agave nectar
Blood orange twist for garnish
Margarita salt for rim

Rub the outside rim of the glass with the blood orange and swirl glass in a pile of salt.  Fill with ice, add ingredients and stir.  Top with blood orange twist.