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\begin{enumerate}
  \item cook onions over medium heat until well-browned
  \item add crushed tomatoes, carrots, and peas and let the sauce boil
  \item add herbs and spices
  \item create a béchamel sauce from milk, salt, and flour
  \item stack up béchamel sauce, lasagna noodles and the vegetable sauce in a baking dish
  \item top with slices of mozzarella cheese and bake
\end{enumerate}

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