Gently rinse 4 cups of fresh blackberries under cool water and pat dry.

Place the rinsed blackberries into a large pot or saucepan.

Add 1 cup of water to the pot with the berries.

Heat the mixture over medium heat for 3 to 5 minutes, stirring occasionally, until the berries soften and begin to release their juice.

Remove the pot from heat and use a potato masher or the back of a wooden spoon to mash the softened berries, pressing against the sides to extract as much juice as possible.

Set a fine mesh strainer or cheesecloth over a large bowl or pitcher and pour the mashed berry mixture through it, pressing gently with the back of a spoon to extract the liquid.

Transfer the strained juice back to a clean pot or pitcher. Stir in 1 tablespoon fresh lemon juice, 2 tablespoons honey if desired, and a pinch of sea salt until the honey dissolves completely.

Allow the juice to cool to room temperature, then refrigerate for at least 1 hour. Serve over ice and enjoy within three days for best flavor.