煮る【にる】
to boil, to simmer, to stew, to seethe
煮やす【にやす】
to cook inside
煮込む【にこむ】
to boil well, to stew, to simmer (for a long time), to cook (various ingredients) together
雑煮【ぞうに】
soup containing rice cakes and vegetables (New Year's dish)
煮詰める【につめる】
to boil down, to concentrate (soup, milk, stock, etc.), to reach a conclusion, to conclude a discussion