Preheat oven to 400 degrees. Place the sweet potatoes and onions on a rimmed baking sheet. Drizzle with 2 tablespoons olive oil, add 1 teaspoon salt, ½ teaspoon pepper, and toss to coat. Roast, turning once or twice, for 30 minutes or until the sweet potatoes are tender and starting to brown. Remove from oven and let cool.
In a large bowl, combine the cooled sweet potatoes and onions with the black beans, red pepper, and cilantro.
Place the jalapeno and garlic in the blender and pulse several times to finely chop. Add the San-J Orange Sauce and ¼ cup olive oil and blend until smooth. Taste and add salt and pepper if desired. Pour the dressing over the vegetables and toss to coat. Serve at room temperature or cold.