Coarse salt and ground pepper
2 slices whole-wheat sandwich bread
1 tablespoon plus 1 teaspoon olive oil
3/4 pound spaghetti
1 teaspoon finely grated lemon zest, plus 3 tablespoons fresh lemon juice
1/2 cup chopped fresh parsley
2 cans (6 ounces each) chunk light tuna in water, drained
Preheat oven to 350 degrees. Bring a large pot of salted water to a boil. Meanwhile, in a food processor, pulse bread and 1 teaspoon oil until coarse crumbs form. Spread on a rimmed baking sheet; season with salt and pepper. Bake until golden, tossing occasionally, 6 to 8 minutes.
Cook pasta in boiling water until al dente. Reserve 1/2 cup pasta water; drain pasta, and return to pot. Add lemon zest and juice, parsley and 1 tablespoon oil; toss, adding enough pasta water to coat. Add tuna; toss gently. Serve sprinkled with breadcrumbs.