Step 1: In a blender, combine the strawberries, blueberries, raspberries, lemon juice, and 1 tablespoon of honey. Blend until smooth.
Step 2: In a medium mixing bowl, whisk together the Greek yogurt, vanilla extract, and the remaining 2 tablespoons of honey until well combined.
Step 3: Taste both mixtures. If you prefer a sweeter treat, add an extra teaspoon of honey to the yogurt or the fruit purée.
Step 4: Spoon a tablespoon of the yogurt mixture into the bottom of each popsicle mold. Follow with a tablespoon of the berry purée.
Step 5: Continue alternating layers until the molds are nearly full, leaving a small gap at the top for expansion. Use a skewer to gently swirl the layers together.
Step 6: Insert popsicle sticks and freeze for at least 4-6 hours, or until completely solid. To unmold, run the outside of the molds under warm water for 10 seconds.