Easy recipe D.I.Y. Steak Sauce

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one head of garlic, halved horizontallyone/two small onion, cut into three/about four" roundstwo Fresno chiles or one/two red bell pepperone/two teaspoon vegetable oilKosher salt (Recipes by ingridients salt) and freshly ground black pepperone quarter cup Worcestershire sauceone quarter cup red wine vinegarone tablespoon (packed) dark brown sugarone teaspoon porcini powderPorcini powder is available at better supermarkets and from olivenation.com. .