Combine all ingredients excluding steak tips in a saucepan, and simmer for 8 minutes, stirring occasionly. Remove from heat and bring to room temperature.
Reserve ½ c of BBQ sauce. Pour the rest in a resealable, leak-proof bag with steak tips, and refrigerate 4 hours.
Preheat oven to 400°F.
Bring steak tips to room temperature. Pat steak tips dry with paper towels, and discard all excess marinade.
Preheat large, cast-iron skillet or oven save skillet, and add 1 Tbsp avocado oil. Once oil is hot, sear steak tips on both sides for 1 minute per side.
Place skillet in oven to finish steak tips. Roast for 3-5 minutes, or until meat thermometer reads 125°F when inserted into the thickest part.
Serve with your favorite stir-fried vegetables and the reserved BBQ sauce.