Harissa Clams and Mussels

Name: Harissa Clams and Mussels
Ingredients: 1 lb clams, cleaned and rinsed; 1 lb mussels, cleaned and debearded; 1 tbsp olive oil; 1 leek thinly sliced; 2 tsp fresh oregano, chopped; ½ cup sweet vermouth; 4 cups smoked harissa sauce, recipe follows; 2 tbsp butter; 4 pieces toasted baguette, optional; 4 tbsp ’nduja, optional; Smoked Harissa Sauce; 1 leek, diced; 1 fennel bulb, thinly sliced; 2 cloves garlic, chopped; 1 lemon zest; ¼ cup harissa paste; 2 tbsp fresh oregano, chopped; 2 cups fresh tomatoes, diced; 2 cups smoked tomato puree