Pasta With Marinara, Olives, and Clams

Ingredients

• Fine sea salt or table salt
• 1 pound spaghetti
• 2 tablespoons extra-virgin olive oil
• 1 teaspoon fennel seeds
• 1/2 teaspoon crushed red pepper flakes, plus more to taste
• One (24-ounce) jar marinara sauce
• Two (6.5-ounce) cans minced clams in juice, drained and juice reserved
• 1/4 cup chopped kalamata olives (about 12 olives)