Bloom the gelatin: Sprinkle 2 tablespoons unflavored gelatin powder evenly over ½ cup cold liquid in a medium glass bowl. Let sit undisturbed for 3-5 minutes until the mixture becomes spongy and thick. Dissolve the gelatin: Slowly pour 1½ cups hot liquid (about 180°F, not boiling) over the bloomed gelatin while whisking continuously for 60 seconds until the mixture is completely smooth and clear with no granules. Add optional ingredients: Stir in 1 teaspoon lemon juice and a pinch of pink salt if desired for extra electrolytes and flavor balance. Set the gelatin: Pour the liquid gelatin mixture into an 8×8-inch glass dish or silicone molds. Refrigerate for at least 4 hours (overnight is ideal for firm, sliceable cubes). Cut and serve: Once fully set, cut the gelatin into 1-inch cubes (you should get 8-12 cubes). Store in an airtight container in the refrigerator for up to 5 days. Consume for metabolism support: Eat 2-3 gelatin cubes 15-20 minutes before meals for appetite control, or 2 hours before bedtime (around 9 PM) for sleep and metabolism support.