Ingredients

<p>Makes about 5 cups berry pur&eacute;e.</p>

　　2 cups strawberries, hulled

　　2 cups raspberries, picked over

　　2 1/2 cups fresh orange juice

　　1/2 cup superfine sugar plus additional to taste

　　1 tablespoon fresh lime juice, or to taste

　　seltzer water or club soda

　　

Step 1

In a blender blend berries, orange juice, 1/2 cup sugar, and lime juice until smooth. Force purée through a fine sieve into a large measuring cup or bowl, pressing hard on solids. Chill purée, covered, until cold and stir in additional sugar.(Purée keeps, covered and chilled, 2 days.)

　　

Step 2

Fill tall glasses with ice and add enough berry purée to fill each glass by three quarters. Top off drinks with seltzer water or club soda and stir well.