Béchamel can be used as a component in lasagna, but it's not the same as "lasagna sauce." Traditional lasagna sauce often refers to a meat-based tomato sauce (like marinara with ground beef or sausage), while béchamel is a creamy, white sauce. In some lasagna recipes, béchamel is layered with the tomato sauce for added richness and creaminess, but they are distinct sauces with different ... More @Wikipedia
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