Roulade de Saumon aux Crabes des Neiges (Smoked Salmon Stuffed with Cottage Cheese and Crab)

Ingredients

• 14 slices smoked salmon
• ¹⁄₂ cup homemade fish stock, or store-bought, chilled
• 1 tbsp. powdered gelatin
• 4 oz. cream cheese, softened
• 2 cups small curd cottage cheese, drained overnight
• 3 tbsp. minced chives
• 2 tbsp. minced dill
• 2 tbsp. minced tarragon
• Kosher salt and freshly ground black pepper, to taste
• 10 oz. cooked snow crab meat, finely shredded
• Lettuce leaves and sliced lemon twists, for garnish (optional)