Champagne punch
Peel the lemon in careful spirals, so that each peel remains in one long strip -- it will be easier to fish them out with tongs or a bar spoon later.
For the punch bowl, use one big block of ice, so that the concoction stays cold but doesn’t get overly diluted as your party progresses. To make a large block of ice, fill an old half-gallon milk carton or a plastic pint or quart take-out container with water and freeze. To prepare ice that has been frozen with raspberries and blackberries: Fill a container that fits in your punch bowl with hot water. Add raspberries and blackberries for decoration and freeze.
Using a vegetable peeler, peel the lemon in lengthwise strips, avoiding the white pith. Reserve the fruit for another use. Place the lemon peel in a sturdy bowl and muddle with the sugar cube until the peels release their oil and the sugar becomes moist and fragrant.
In a shaker without ice, shake the lemon peel, sugar, cassis and elderflower liqueur. Strain into a chilled punch bowl over a large block of ice that has been frozen with raspberries and blackberries in it. Add the Champagne and garnish with raspberries and blackberries.
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