Sprinkle the unflavored gelatin powder over 1/4 cup cold water in a large mixing bowl. Let it sit for 5 minutes until the gelatin absorbs the water and becomes spongy. Pro tip: Don't skip the blooming step - it ensures smooth, lump-free gelatin every time.

Bring 1 1/2 cups of water to a rolling boil. Slowly pour the boiling water over the bloomed gelatin while whisking constantly to dissolve completely. Pro tip: Pour slowly and keep whisking to prevent any lumps from forming.

Add the fresh lemon juice, liquid stevia, and coconut extract (if using). Whisk until everything is well combined and taste for sweetness, adjusting stevia as needed.

Allow the gelatin mixture to cool for 10 minutes at room temperature. Gently fold in the mixed berries and lemon zest, distributing them evenly throughout the mixture. Pro tip: If the mixture is too hot, the berries will break down and make it cloudy.

Pour the mixture into your prepared 8x8 inch dish or individual molds. If using one large dish, the gelatin should be about 1 inch thick. Pro tip: Lightly spray your molds with cooking spray for easy removal later.

Refrigerate for at least 2 hours or until completely set. The gelatin should be firm and bounce back when gently touched.

Cut into squares if using a large dish, or carefully remove from individual molds. Serve chilled and store any leftovers covered in the refrigerator. Pro tip: Dip the bottom of individual molds in warm water for 10 seconds to help release the gelatin easier.