Makes eight servings.
Heat the oil in a medium-size pot over high heat then add the onions.
Cook until the onions are lightly caramelized.
Stir in the tomato paste and cook for 1 minute.
Pour in the beer and water then bring to a simmer.
Add the salt and sugar then continue cooking until the mixture is slightly thickened.
Serve in a bowl as a topping for hot dogs or other grilled meats.