Mix oil and eggs in a medium sized bowl. Add matzo meal and salt and mix well. Add seltzer and mix until well incorporated. Cover and place in fridge for at least an hour.

After an hour, bring a pot of salted water to a boil.

Scoop out a heaping tablespoon of the matzo ball mix and flatten it in your hand. Put the prune in the middle and wrap the matzo ball around it. Roll it well with your hands and drop into the boiling water. Repeat until all the matzo balls are in the pot. Cover and reduce temperature to low. Let simmer at least 20 minutes.

Serve matzo balls in your favorite chicken soup.