#1 Buy yourself a nice fatty roast a cut it in 1" cubes.
#2 Buy a roll pre-ground spicy breakfast sausage. Cube the roll in 1"
#3 Using a 1:1 ratio, grind them together in meat grinder and make your patties from these. aa
Of course you can add Kosher salt, or freshly ground black pepper during the grind. Yea baby......
Bob