In a 4-quart Dutch oven combine frozen strawberries, sugar, honey, water, lemon peel, lemon juice, and peppercorns. Cook, uncovered, over medium heat until mixture comes to boiling, stirring frequently. Remove from heat. Stir in sage. Let mixture stand, uncovered, for 1 hour.
For syrup, press strawberry mixture through a fine mesh sieve; discard solids (you should have 4 to 5 cups sieved syrup). Syrup may be covered and refrigerated up to 3 days.
To serve, combine the syrup and ice cubes. Slowly add champagne. Garnish with additional fresh sage leaves and fresh berries. Makes 14 to 16 servings.