Place bread cubes in a bowl; pour milk over bread. Let stand 5 minutes.
Gently combine soaked bread cubes, beef, cumin, pepper, and 1 teaspoon salt in a medium bowl. Gently shape into 12 (1½-inch) meatballs.
Heat a Dutch oven over medium-high. Add oil to pan; swirl to coat. Add meatballs in a single layer; cook, turning to brown on all sides, about 4 minutes. Transfer meatballs to a plate.
Add squash, onion, and garlic to pan; cook, stirring occasionally, 3 minutes. Add stock, scraping pan to loosen browned bits. Add remaining ½ teaspoon salt; cook until liquid is reduced by half, about 6 minutes.
Add tomatoes and tomato sauce; bring to a simmer. Cook, stirring occasionally, until slightly thickened, 6 to 8 minutes.
Stir in cauliflower; cover and cook 3 minutes. Return meatballs to pan; cover and cook just until meatballs are cooked through, 6 to 8 minutes.
SERVES 4 (serving size: 2 cups)
CALORIES 335; FAT 13.1g (sat 3.3g, mono 71g, poly 1.6g);
PROTEIN 29g; CARB 29g; FIBER 7g; SUGARS 10g (est. added sugars 1g); CHOL 62mg; IRON 5mg; SODIUM
556mg; CALCIUM 120mg
