Step 1

Heat 4 Tbsp. oil in a large skillet or pot over medium. Cook anchovies and sliced garlic, stirring occasionally, until anchovies are mostly dissolved and garlic is soft (do not let it brown), 6–8 minutes. Add red pepper flakes and paprika and cook, stirring, just until fragrant, about 30 seconds. Add tomatoes, crushing with your hands as you go. Break up with a wooden spoon until no large pieces remain; bring to a simmer and cook, stirring occasionally, until reduced to a very thick sauce, 20–25 minutes. Add a splash of water to loosen; reduce heat to low and keep warm.

Step 2

Meanwhile, blanch kale in a large pot of boiling salted water just until bright green, about 10 seconds. Transfer with a slotted spoon or tongs to a bowl of ice water; let cool. Drain and squeeze kale with your hands to remove excess water; coarsely chop. Reserve pot with kale cooking liquid for cooking pasta.

Step 3

Pulse bread in a food processor until fine crumbs form. Toss breadcrumbs with remaining 1 Tbsp. oil in a medium skillet. Season with salt and gently toast over medium heat, tossing often, until golden brown and crunchy, 6–8 minutes. Finely grate remaining garlic clove over crumbs and stir to coat. Transfer to a small bowl and mix in parsley.

Step 4

Bring kale cooking liquid to a boil and cook pasta, stirring occasionally, until al dente. Using tongs, transfer to skillet with sauce and add kale and tuna. Toss to combine, adding water a few tablespoonfuls at a time to loosen as needed, until pasta is well coated. Serve pasta topped with breadcrumbs.