Corn Chowder with tortillas

2 tablespoons butter 1/4 small yellow onion , diced 2 tablespoons all-purpose flour 3 cups chicken stock 2 lbs frozen corn kernels , thawed 10 roma tomatoes ,[...]

5 ears corn , shucked 2 slices bacon , cut into 1/2 inch pieces 1 medium yellow onion , diced 2 -3 chipotle peppers (in adobo sauce, finely diced) 4 cups low[...]