Assemble your supplies.
3 cups of ice sitting in a bowl of water to soften (about 15 minutes)
one lemon
sugar
berries
libation of choice
knife
blender
reamer
It should look something like this:

Directions:
Cut the lemon in half and juice it directly into the blender. Dump in 1/4 cup each of sugar and vodka. Blend. Drain the water out of your ice and add it to the blender - you should have about 2 1/2 cups. Pulse until smooth.
Pre-softening the ice really makes a difference in the texture - if you don't you'll have little icy granules which isn't exactly the end of the world but isn't exactly what you're going for here either. Of course I'm sure this doesn't apply if you have a fancy blender. Like say a
Vita-Mix 1700 Turbo Blend 4500 Countertop Blender with 2+ HP Motor
. In which case yeah, yay for you. Whatever.
Anyway. Pour the lemonade into the glass. Leave what sticks to the bottom in there and throw in 1/4 cup of berries. Pulse a few times and pour on top of the lemonade.
Stick a straw in your glass and admire.

Sip contentedly. Avoid brain freeze.