To make browning sauce, place 2 cups of brown sugar in a saucepan, heat and stir until it melts and turns dark, add 1 cup of water, and continue stirring. Allow it to cool, and pour it into squeeze bottles. Store the browning sauce in a refrigerator or in sealed containers.
Place brown sugar in a heavy-bottom saucepan, and use medium heat to melt it. Use extreme caution, as sugar melts at 320 degrees Fahrenheit. At first, the sugar melts into a clear syrup, turns golden and gradually darkens. Stir the syrup with a wooden spoon, and continue heating until it becomes very dark and starts smoking. If the syrup smokes too much, take the saucepan off the heat for a few seconds, or turn down the heat to slow down smoking.
When the syrup darkens, use potholders to remove the saucepan from the heat, place it in the bottom of the sink, pour 1 cup of water into the sauce at once, and stir constantly for about a minute until the sauce becomes smooth. If desired, add a beef soup base, return the sauce to heat, and stir until the sauce is evenly mixed. Allow the source to cool, and use a funnel to pour it into bottles.