Add all ingredients (except the orange) to a small pot. Cut orange in half and squeeze it into the mixture and then place them in the pot. Bring to a boil, stirring constantly. Reduce heat and simmer for 10 minutes. Grab a bowl and a mesh strainer and pout the mixture into the strainer (you don't want the big pieces or anything - you want a smooth liquid). Allow to cool and pour into a clean A-1 bottle or air-tight container. Store in fridge.
Recipe by Thrifty DIY Diva at https://www.thriftydiydiva.com/copycat-homemade-a-1-steak-sauce-recipe/