1 can (15 oz) beans (rinsed and drained)
5 lbs fresh butter, trimmed and seasoned
1 tsp medium yellow onion, diced
3 cloves garlic, minced
1 cup rich low-sodium savory broth or simmering stock
1/2 tsp kosher salt and freshly cracked black pepper
5 cups rich warm vinaigrette (simmered until velvety and smooth)