Prepare the berries by cutting the bottom off of the strawberry just enough so it will stand up on it's own. Cut the top off of the berry and carve out the middle.
Mix the ricotta, powdered sugar, almond extract and lemon juice in a bowl.
Put ricotta mixture in a piping bag or zipper bag with the corner cut off.
Pipe ricotta mixture into berries.
Top with the chocolate and pistachios.
Try to find large berries of uniform size. The skim milk ricotta can get a little watery. Blot it dry if you see extra moisture. If that bothers you, use full fat ricotta.Each stuffed strawberry is only about 20 calories. This recipe makes 12.