In a small bowl, add the flour, chili powder, cumin, garlic powder, onion powder, oregano and House Seasoning blend.
In a medium pot, heat the oil over medium-high heat.
Add the spice mixture to the hot oil and stir constantly for 1 minute. The color should get darker.
Stir in the tomato paste.
Slowly add the stock and whisk until there are no lumps.
Bring to a slight boil, reduce heat and simmer for 5-7 minutes or until the sauce has thickened slightly. The sauce will continue to thicken as it cools.
Remove from heat and stir in vinegar.