Halve avocados and remove pit. Roll limes or heat in microwave for 10 seconds to get juices flowing. Halve the limes. Rub the avocado halves gently with 1/2 lime to retard the browning. Juice limes into small bowl and mix with sugar, chili powder and salt using a fork or small whisk. Add extra-virgin olive oil in a slow stream while mixing dressing. Pour dressing into the cavities of avocados, distributing it equally and serve. Garnish with chives or cilantro as an optional garnish.
Recipe courtesy of Rachael Ray