Roast beef bones and pig trotters for 30 minutes, then flip and roast for another 30 minutes.
Prepare vegetables and aromatics.
Add roasted vegetables to the tray with tomato paste and roast for 20-25 minutes.
Place bones in a large pot, cover with ice cold water, and bring to a simmer.
Skim impurities from the surface for the first hour of cooking.
Add roasted vegetables after 8 hours of cooking, aromatics after 9 hours, and turn off heat at 9.5 hours.
Strain the stock through a fine sieve or cheesecloth.
Store the stock in airtight containers in the fridge for 3-4 days or freeze for up to 6 months.
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