Preheat oven to 375°F. Arrange bones in a single layer on a baking pan.
Roast until deep golden brown, 1–1½ hours. Cool slightly.
Add bones, vegetables, herbs, peppercorns, and tomato to a large pot or slow cooker. Add cold water to cover.
Simmer uncovered on low heat for 8–14 hours. If you're using a slow cooker, partially cover with the lid.
Strain through a fine sieve and discard solids. Let cool to room temperature.
Cover and refrigerate for up to 4 days, or freeze for up to 6 months.
NOTES
Smoked Stock: For a smoked venison stock, roast the bones in your smoker instead of the oven. Avoid strong-tasting woods such as mesquite.Venison Broth: Add deer meat (½–1 lb) to the pot to make a broth variation. I like to use shank and neck meat.Building Flavor: For a more herb-forward stock, add in a few more fresh sprigs of rosemary and thyme during the last hour of cooking. For a richer stock, add in any silverskin trimmings that you have saved.Storage: Keep refrigerated for 4 days or freeze flat in bags for 6 months.Reheating: Warm gently on the stovetop over low heat—avoid boiling.Serving Ideas: Use as the base for Venison Gravy, Venison Stroganoff, or Crockpot Venison Stew.