Preheat oven to 425 degrees F. Place a large rimmed baking sheet on the middle oven rack as the oven heats. Use two sheets if your baking sheet is smaller than 18x26'' to avoid overcrowding, alternating the sheets if on different oven racks halfway through baking time.
Toss diced beets, apple and onion with olive oil and sea salt in a large bowl.
Once oven is preheated, use mitts to remove baking sheet(s) from oven and spread beet mixture into an even single layer.
Return sheet to oven and roast for 20 minutes, tossing halfway through cooking time. Sprinkle sage on top and roast 8 to 10 more minutes until tender and golden.
Let cool slightly while you make dressing. Whisk together all dressing ingredients in a small bowl until smooth.
Toss roasted beets with dressing in a serving bowl and serve warm.
Recipe by Autoimmune Wellness at https://autoimmunewellness.com/roasted-golden-beets-apple-sage/