Start by cutting the melon into small cubes so it blends easily. Remove the thyme leaves from the stems because the stems can add bitterness. Measure the sugar and apple cider vinegar before starting to keep the process smooth.
Place the melon cubes, thyme leaves, sugar, and apple cider vinegar in a blender. Blend everything until the mixture becomes smooth and fully combined. This step helps release the melon juice and distribute the herbal flavor evenly.
Pour the blended mixture into a clean glass jar with a lid. Seal it tightly and place it in the refrigerator. The cold environment helps the flavors infuse slowly while keeping the shrub fresh.
Let the mixture rest for at least 24 hours or up to three days. During this time the vinegar extracts flavor from the melon and thyme, creating a balanced sweet and tangy concentrate.
After steeping, strain the mixture through a fine mesh strainer. For a clearer shrub, use a double mesh strainer or a nut milk bag. This removes pulp and herb particles, leaving a smooth syrup.
Pour the strained shrub into a clean bottle or jar. It is now ready to use in refreshing drinks, cocktails, or creative recipes.