Set Sun Oven out to preheat
In a medium-sized pot, combine the onion, carrots, orange zest and juice, and curry paste. Stir well.
Cover and place in the Sun Oven until carrots are very tender. About 2 hours.
Once removed from Sun Oven, let cool in the pot for about 10 minutes. Transfer the cooked carrot mixture to a food processor and process until smooth.
Scrape the puree into a bowl and let cool completely. (NOTE: This and preceding steps can be made in advance to this point, for later enjoyment. Refrigerate the puree in an airtight container for up to 3 days).
Add the yogurt and torn basil pieces to the pureed carrots and stir well.
Stir in the lemon juice and season to taste with salt and pepper.
Serve at room temp.