Place meatballs, ketchup and grape jelly in a large saucepan.
Cook over low heat for 1 hour, stirring occasionally to mix the sauces. Continue to heat until hot the whole way through and sauce has reduced and darkened in color.
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To serve Grape Jelly Meatballs as an entree, serve over mashed potatoes!
Instant Pot Grape Jelly Meatballs
Use the same ingredients, drop everything (including frozen meatballs) into the inner pot of the Instant Pot and set for manual pressure, high or 6 minutes. Use quick release function, stir well and serve!