Preheat oven to 475 degrees. Add 1/4 cup of salt to at least 4 quarts of wate, and bring to a boil.
Toss the broccoflower with about 2 tablespoons of olive oil, and salt. Place in a roasting pan with 2 cloves of garlic. Roast in the oven on the lower rack about 20 minutes, or until the edges get browned.
Add the pasta to the boiling water, and cook until slightly underdone.
Pour the remainder of the olive oil in a sauce pan, and heat over medium. When hot, add in the tuna, garlic, and chili flakes. Saute for 1-2 minutes or until the garlic is fragrant. Stir in the broccoflower and roasted garlic, and the lemon zest.
Add in the underdone pasta to the sauce, along with 1 to 2 ladles of pasta water. Stir in the butter, and cook until the pasta absorbs all the water. You may need to add splashes of more pasta water as needed to create a sauce that thoroughly coats the pasta. Add in the optional capers.
Off the heat, stir in half the parsley, Parmigiano, salt, pepper, and lemon juice. Top with bread crumbs and remaining parsley. Have some additional chili flakes and Parmigiano for those who want a bit more.