In a small saucepan, whisk together the ketchup, The Holly Tree Organic Yellow Mustard Powder, apple cider vinegar, honey, Worcestershire sauce, olive oil, and water until smooth.
Stir in The Holly Tree Organic Black Pepper Powder, The Holly Tree Organic Garlic Powder, The Holly Tree Organic Cayenne Powder, and Salt.
Place the saucepan over medium heat and bring the mixture to a gentle simmer.
Cook for 8–10 minutes, stirring occasionally, until the sauce thickens slightly and the flavors meld together.
Remove from the heat and allow the sauce to cool for 10 minutes.
Transfer to a clean glass jar or airtight container and refrigerate before serving.