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In a small bowl, stir together the buttermilk, orange juice and orange zest.
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In a large bowl, whisk together the flour, agave nectar, canola oil, baking soda and cream of tartar.
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Add the buttermilk mixture and blueberries to the bowl with the flour mixture. Mix gently by hand until well combined.
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Transfer the batter onto a lightly floured baking pan. Pat into a circle about ¾ inch thick and 8 inches across. Use a knife to cut the circle into 14 wedges, cutting almost all the way through.
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Slide the baking pan into Rack Position 1, select Convection Bake, set temperature to 375ºF (190ºC) and set time to 20 minutes.
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When cooking is complete, remove the pan and check the scones. They should be lightly browned.
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Let rest for 5 minutes and cut completely through the wedges before serving.