Lentil Soup in Acorn Squash Bowls

Name: Lentil Soup in Acorn Squash Bowls
Ingredients: 2 cups (402g) dried lentils; 8 cups (1,9L) water; 1-2 slices bacon, uncooked and cut into pieces, optional; ½ of a medium onion, sliced; ¼ cup (57g) chopped carrots (roughly one carrot stick); ½ cup (115g) chopped celery (roughly one rib of celery); 3 Tbsp (8g) chopped parsley; 2 garlic cloves, minced; 1 tsp (5g) salt, to taste; ¼ tsp (1g) black pepper; ½ tsp (0,3g) oregano; 1-pound can solid pack tomatoes; 2 Tbsp (30mL) red wine vinegar