Farfalle With Cauliflower, Walnut, And Lemon

Ingredients

• salt and pepper, to taste
• 1/2 pound farfalle
• 1/4 cup extra-virgin olive oil, plus more to taste
• 1 small head cauliflower, cut into bite-sized florets, remaining stems chopped
• 1 tablespoon butter
• 1/2 white or yellow onion, diced
• 1 tablespoon capers, chopped
• 1 cup raw unsalted walnuts
• 2 tablespoons sun-dried tomatoes, diced
• zest of 1 lemon
• pinch of red pepper flakes (optional)
• 1/4 teaspoon dried tarragon
• 1/3 cup diced asiago cheese, or to taste