Patriotic Taco Salad

1 pound ground turkey or beef

1 medium onion, chopped

1-1/2 cups water

1 can (6 ounces) tomato paste

1 envelope taco seasoning

6 cups tortilla or corn chips

4 to 5 cups shredded lettuce

9 to 10 pitted large olives, sliced lengthwise

2 cups (8 ounces) shredded cheddar cheese

2 cups cherry tomatoes, halved