Briefly heat the olive oil or canola oil in a soup kettle or Dutch oven, preferably one that has a lid and a nonstick surface. Add the onion, and sauté it for 2 minutes. Add the garlic and jalapeño, and sauté the vegetables for another minute. Add the celery, curry powder, hot curry powder, cumin, paprika, and salt (if using), and sauté the ingredients 1 minute longer.
Stir in the broth and water, and bring the mixture to a boil. Add the potatoes reduce the heat, partially cover the pot, and simmer the mixture for 10 minutes.
Add the evaporated milk (see "Preparation tip"), and bring the mixture up to a boil. Add the tuna, and, when the ingredients just reach the boiling stage, reduce the heat, and simmer the chowder in the uncovered pot for 4 minutes. Add the peas, and cook the chowder 1 minute longer.
Serve the chowder piping hot, topping each serving with the diced apple.