A Green Peas Soup Without Meat

Name: A Green Peas Soup, Without Meat
Ingredients: 10 cups fresh or frozen peas or petits pois (small, young green peas), divided; 6 cups water, divided; 1 1/2 teaspoons salt; 1/4 teaspoon ground black pepper; 1/2 teaspoon ground mace; 2 cloves; 2 teaspoons dried thyme; 1 teaspoon dried marjoram; 4 tablespoons unsalted butter; 3 to 4 green onions, trimmed and sliced crosswise into 1/2-inch pieces; 1/4 pound fresh baby spinach, coarsely chopped; 2 teaspoons minced fresh mint; 3 tablespoons all-purpose flour; Diced toast for garnish (optional); Shredded fresh calendula blossoms for garnish (optional)