Thinly slice, or cut into chunks and pulse in a food processor until finely chopped:
Heat in a heavy saucepan over medium heat:
Add the vegetables and cook, stirring, until softened, 6 to 8 minutes. If desired, add:
Cook until most of the wine has evaporated. Stir in:
Bring almost to a boil over medium-high heat, then reduce the heat and simmer gently for about 30 minutes, skimming any scum. If added body is desired, 5 minutes before the stock is finished, stir together in a small bowl:
Let the gelatin bloom for 5 minutes. Strain the stock and whisk in the gelatin until dissolved. Use the stock immediately or let it cool, cover, and refrigerate for up to 4 days.