This is the 9560th most frequent Japanese word.
練り
"練り" (neri) means kneading, refining, or elaboration.
Here, '練り込む' (nerikomu) means 'to knead or blend into,' showing a culinary application where ingredients are combined extensively.
カレーのソースを練り込むために、材料を混ぜる必要があります。
To blend the curry sauce, you need to mix the ingredients.
In this sentence, '練り上げる' (neriageru) signifies 'to refine or perfect,' typically used in contexts requiring elaborate thought or effort to develop something.
彼は政策の詳細を練り上げるのに多くの時間を費やしました。
He spent a great deal of time refining the details of the policy.
Here, '練って' (nette) is a direct application of 'kneading,' in the context of manipulating material for molding or shaping.