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Melt the unsalted butter in a large, deep skillet or Dutch oven over medium-low heat.

Add the thinly sliced yellow onions to the melted butter. Reduce the heat to low and cook, stirring occasionally, for 30-40 minutes, or until the onions are deeply golden brown and caramelized. Ensure they do not stick or burn, adjusting heat as necessary.

Pour in the dry white wine, scraping up any browned bits from the bottom of the pan. Let it simmer for 2-3 minutes until the liquid has mostly evaporated.

Stir in the Worcestershire sauce and fresh thyme.

Add the vegetable broth and the rigatoni (or preferred pasta) to the skillet. Stir to combine, ensuring the pasta is mostly submerged in the liquid.

Bring the mixture to a boil over medium-high heat. Once boiling, reduce the heat to low, cover the skillet, and simmer for 10-12 minutes, or until the pasta is al dente and most of the liquid has been absorbed, and the sauce has thickened. Stir occasionally to prevent sticking.

Remove from heat and stir in the grated Parmesan cheese or nutritional yeast until melted and well combined.

Serve immediately, garnished with additional Parmesan cheese if desired.


Melt the unsalted butter in a large, deep skillet or Dutch oven over medium-low heat.

Add the thinly sliced yellow onions to the melted butter. Reduce the heat to low and cook, stirring occasionally, for 30-40 minutes, or until the onions are deeply golden brown and caramelized. Ensure they do not stick or burn, adjusting heat as necessary.

Pour in the dry white wine, scraping up any browned bits from the bottom of the pan. Let it simmer for 2-3 minutes until the liquid has mostly evaporated.

Stir in the Worcestershire sauce and fresh thyme.

Add the vegetable broth and the rigatoni (or preferred pasta) to the skillet. Stir to combine, ensuring the pasta is mostly submerged in the liquid.

Bring the mixture to a boil over medium-high heat. Once boiling, reduce the heat to low, cover the skillet, and simmer for 10-12 minutes, or until the pasta is al dente and most of the liquid has been absorbed, and the sauce has thickened. Stir occasionally to prevent sticking.

Remove from heat and stir in the grated Parmesan cheese or nutritional yeast until melted and well combined.

Serve immediately, garnished with additional Parmesan cheese if desired.
