Springtime Crockpot Minestrone

Name: Springtime Crockpot Minestrone
Ingredients: 1 sweet onion, (diced); 3 garlic cloves, (minced); 3 carrots, (peeled and sliced); 1 (28 ounce) can of diced tomatoes; 2 (15 ounce) cans of cannellini beans, drained and rinsed; 3 cups low-sodium vegetable stock; 3 cups water; 8 ounces of uncooked ditalini pasta; 12 thin asparagus spears, (stems removed and cut into thirds); 1 cup of frozen sweet peas; 1 (6 ounce) bag of fresh spinach; 1/3 cup freshly grated romano cheese + more for topping; salt and pepper to taste