BBQ hamburgers outside on grill until almost done.
2 hours before serving; In a 2 qt sauce pan boil 1 qt of water and add beef base. Bring to a boil.
In slow cooker layer hamburgers and onions.
Pour beef base over hamburgers and onions until just covered. Cook on high for 1 hour then turn to low. Serve within 6 hours. Serve on rolls.
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