Traditional Greek Stuffed Cabbage Rolls (lahanodolmades)

Name: Traditional Greek Stuffed Cabbage Rolls (lahanodolmades)
Prep time: 1 h
Cook time: 1 h
Total time: 2 h
Cuisine: Greek
Ingredients: 1 large head of cabbage, about 2-2.5 lbs; ¾ - 1 cup medium grain rice (or, short grain rice, like Arborio); 1 lb. lean ground beef; 1 medium onion, grated; 2 spring onions, minced; 1 small carrot, grated; 2 TBSP. olive oil; ½ cup fresh, flat-leaf parsley, minced; ½ cup fresh dill, minced; 1 tsp. sea salt; ½ tsp. freshly ground pepper; 4 cups chicken stock; 1 cup hot water (plus more as needed); 1 tsp. salt; ¼ tsp. freshly ground pepper; 3 large eggs (1 whole + 2 egg yolks); 1 large lemon (juiced - about ¼ cup), or more to taste; 2 tsp. corn starch; Lemon slices; fresh, chopped dill; freshly ground pepper