Spiced Sweet Potato and Black Bean Tacos

1 avocado, halved and pitted 1 tablespoon lemon or lime juice Preheat oven to 425 degrees F. Place parchment paper onto a baking sheet. Toss cubed sweet potatoes with olive oil and place them on the prepared baking sheet. Roast them for approximately 40 minutes, or until tender. (Cubed, previously baked sweet potatoes work well, too. Just reheat in the microwave fo...

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