Heat a large pan and add the bacon fat. Add the garlic, and sauté, stirring constantly until the garlic is light tan.
Add the frozen beans, Cannellini beans, and sausage. Remove from the heat.
Cook the pasta with a little salt in another large pot. Have ready a heatproof measuring cup. Drain two cups of the pasta water into the measuring cup, and discard the rest of the water when draining the pasta.
Add the pasta to the bean mixture, then add the rest of the ingredients, except for the cheese.
Cook on low heat for about 20 minutes. Serve in pasta bowls with cheese on the side for garnish.
Notes
Variations You can omit the sausage and substitute bacon. Cook the bacon and garlic together until the bacon is crisp.
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