Minestrone Soup

1 . Stage

In a medium saucepan over high heat, bring 5 cups water to a boil; season with 1 1/2 teaspoons salt. Add shells and cook, stirring occasionally, until al dente, about 7 minutes. Drain and transfer to a medium bowl. Add butter and toss to combine.

2 . Stage

Meanwhile, in a large pot over medium-high heat, heat oil. Add onions, celery, and carrots; season with salt and pepper. Cover and cook, stirring occasionally, until onion is translucent and carrots begin to soften, about 8 minutes. Uncover, add garlic, and cook, stirring, until fragrant, about 1 minute. Add tomato paste and cook, stirring, until brick red, about 1 minute. Add broth, tomatoes, and Parmesan rind (if using). Bring to a simmer and cook, stirring occasionally, until tomatoes are cooked down and broth is slightly thickened, about 5 minutes; season with salt and pepper, if needed.

3 . Stage

Reduce heat to medium. Add zucchini and beans and cook, stirring occasionally, until al dente, 7 to 8 minutes. Remove from heat and stir in kale, basil, and pasta.

4 . Stage

Divide soup among bowls. Top with Parmesan and drizzle with oil.