One of the things you'll miss most of all when you move your grilled meal indoors is that great smoky flavor you get from an open flame. You can't completely replace that taste, but using liquid smoke is a great way to trick your senses into thinking that your steak was cooked over natural wood coals. You can find liquid smoke alongside the other marinades and barbecue sauces in the grocery store. The great thing about liquid smoke is that it's actually manufactured from the burning of popular barbecuing woods like mesquite and apple wood. Add just a small amount of liquid smoke to any marinade to provide the outdoor barbecue flavor you love.