Tea Sandwiches: Deviled Egg & Cress

• 4 eggs
• 4 tablespoons (60 g) unsalted butter, at room temperature

In a heavy saucepan, combine the eggs with water to cover by 1–2 inches (2.5–5 cm) and bring to a boil over high heat. Remove from the heat, cover, and let stand for 15 minutes. Transfer the eggs to a bowl