I used a bag of frozen strawberries, pulsed them in my food processor (yes frozen), then made the lemonade with sugar and mixed in the strawberry slush. Then I strained it to get the seeds and bigger pieces out. I also used frozen strawberries to act like ice cubes as we drank it. This was really good, we all loved it.
1 lb bag frozen strawberries
1/4 cup sugar
Water to fill 2 quart pitcher
Make lemonade with sugar and water in a large pitcher.
Pulse frozen strawberries in food processor until well broken down. Add to lemonade mix.
Strain all through a fine sieve to get seeds and larger pieces out. Serve.