DO-AHEAD TIP: Marinate steak strips overnight or for at least 4 hours (see recipe).
Place steak strips in a large zipper-topped plastic bag. Prepare marinade: In a medium bowl, whisk together next 8 ingredients (orange juice through salt).
Pour mixture over steak strips then seal bag and refrigerate overnight or for at least 4 hours. Melt the coconut oil in a large skillet with a tight-fitting lid over medium-high heat.
Add the red onion and cook for 1 minute. Add steak strips, reserving marinade, and cook for 3 to 5 minutes. Stir in reserved marinade along with remaining veggies (red bell pepper through carrot).
Reduce skillet heat to medium; and cook and stir for 5 minutes. Reduce heat to low, cover pan, and simmer for 5 to 10 minutes, or until veggies are cooked through. Serve hot and enjoy!