Elegant Bites: Salmon Mousse On "Bagel Pastries"

Ingredients

• 4 tablespoons unsalted butter
• Generous pinch salt
• 1/2 cup water
• 1/3 cup plain flour
• 2 eggs
• Beaten egg
• 2 teaspoons nigella seeds
• 3 1/2 ounces smoked salmon
• 1 cup plus 2 tablespoons ricotta cheese
• 3 tablespoons double cream
• juice of 1/2 lemon
• 3 teaspoons chopped dill
• 1 3/4 ounces keta (salmon roe)
• freshly ground black pepper