A taste of spring, these open-face sandwiches are fresh and hearty. Delicate poached chicken and creamy Pea, Almond, and Ricotta Spread are topped with English and sugar snap peas plus crisp radishes and cool mint.
Preheat oven to 450 degrees. Combine 6 cups water, zest, and 2 teaspoons salt in a saucepan. Season chicken with salt and pepper; add to pan. Bring to a boil, then reduce heat to low; simmer until chicken is just cooked through and a thermometer inserted in thickest parts registers 155 degrees, about 10 minutes. Remove from heat; let cool in liquid 1 hour. Remove and pat dry. Thinly slice against the grain.
Meanwhile. Bring a small pot of salted water to a boil; add English peas. Return to a boil; cook 1 minute. Drain; run under cold water. Pat dry.
Brush bread with oil and season with salt and pepper. Place on a rimmed baking sheet; toast in oven until crisp and golden brown on edges but still soft inside, 10 to 12 minutes. Whisk together mustard and lemon juice. Whisk in oil in a slow, stead stream; season with salt and pepper. Toss 2 tablespoons dressing with English peas, snap peas, radishes, and mint.
Spread each toast with 1 tablespoon Pea, Almond, and Ricotta Spread; top with chicken. Spread 1 tablespoon hummus over chicken on each. Top with some radish-and-pea salad, pressing down lightly to adhere, and serve alongside remaining salad, drizzled with more dressing.