1. Preheat grill on medium-high heat. Halve peaches and remove the pit. Brush canola oil on cut halves and place cut-side down on grill. Grill for 3-5 minutes, or until slightly softened. Remove from grill and allow to cool slightly.

2. Place peaches in blender or food processor and blend until completely smooth. Strain out pulp. Pour peach puree into pitcher with ice and pour in lemonade. Whisk to combine. Add sugar if desired, for additional sweetness.