Preparation

• In a large bowl, combine the vinegar, extra-virgin olive oil, 1 tsp. garlic, 1/2 tsp. salt, and 1/4 tsp. pepper. Cook the pasta according to package directions until al dente. Drain, transfer to the bowl with the dressing, and toss to coat.
• Meanwhile, in a 12-inch skillet, combine 1 Tbs. butter and 1 Tbs. olive oil over medium-high heat until the butter is melted. Add the carrots, asparagus, and onions, and cook until the carrots and asparagus are crisp-tender, about 4 minutes. Add the snap peas and cook until bright green, about 1 minute more. Transfer the vegetables to the bowl with the pasta.
• Add the remaining butter and olive oil, and heat over medium heat until the butter melts. Add the shallots, celery seed, and a generous pinch of cayenne, and cook until the shallots are translucent, about 2 minutes. Add the remaining 2 tsp. garlic and cook for another 15 seconds. Add the chicken broth and bring to a boil; cook until it’s reduced by half, about 5 minutes. Lower the heat to medium low and whisk in the mascarpone, whisking until the cheese is dissolved into the broth. Continue to cook until slightly thickened, about 2 minutes more.
• Return the pasta and vegetables to the skillet and cook until heated through, about 2 minutes. Add the dill and toss to coat. Season to taste with salt and pepper, toss with the microgreens, and serve immediately.