Try this Homemade Granular Vegetable Broth recipe.
Commercial bouillon cubes rely heavily on palm oil and fillers, whereas homemade granular vegetable broth harnesses simple cellular mechanics. Coarse salt draws moisture from chopped roots and brassicas through osmosis. This initial simmering stage requires zero added water. Vegetables break down into a thick pulp before oven drying. Spread this mash onto parchment paper in a layer under two millimeters thick to ensure even moisture evaporation.
Exact proportions of carrots, celery, and onions remain flexible based on refrigerator scraps. Crucially, adjust the coarse salt ratio if omitting high-moisture items like zucchini, because salt acts as the primary preservative agent and structural base. Without a thermometer, judge doneness entirely by sight and touch. The dehydrated vegetable sheets must shatter completely under finger pressure rather than bend. Blend the cooled, brittle shards into a fine powder and store the resulting granules in airtight glass jars away from humidity.