Please read About Aspics and Gelatin. If using store-bought stock, be mindful of its salt level when seasoning the stock mixture.
Combine in a medium bowl and let stand for 5 minutes to soften the gelatin:
Bring to a boil in a small saucepan:
Whisk the hot liquid into the softened gelatin until completely dissolved, then stir in:
Refrigerate the stock mixture. When it is the consistency of raw egg whites, about 30 minutes, layer the stock mixture in a lightly oiled 4-cup mold, bowl, or 9 × 5-inch loaf pan with any of the following:
Refrigerate until set, at least 3 hours, but preferably overnight. Unmold the aspic onto a platter and garnish with:
Serve cold, with or without: