In your sentence, "ground" is correct. " The verb "to ground", whose past participle is "grounded", means to prevent somebody or something from leaving some place.
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fatimah07861."I ground/grounded the spices into a thin paste."'Ground' is the past simple (second form) in #1 and the past participle (3rd form) in #2.
2."I have ground/grounded the spices into a thin paste."
fivejedjon fatimah07861."I ground/grounded the spices into a thin paste."2."I have ground/grounded the spices into a thin paste."'Ground' is the past simple (second form) in #1 and the past participle (3rd form) in #2.Oops! I didn't notice the first sentence. Thanks fivejedjon