煮汁 is read as にじる (nijiru) and means broth.
にじる
nijiru
にだしじる
(soup) stock
にる
to boil
にこむ
to cook (various ingredients) together
につめる
to boil down
にもの
nimono
にたつ
にこみ
stew
にえきらない
half-cooked
につまる
to approach a conclusion (of a discussion, investigation, etc.)
にぼし
(small crunchy) dried sardines
にだす
to extract essence by boiling
にあい
stew made from multiple ingredients