Since the link for the tuna curry isn't working for some people, here's the recipe from AllRecipes.com

Tuna Curry in a Hurry
submitted by sal
4 servings

2 tablespoons butter
1 clove garlic, minced
1/3 cup chopped onion
1/3 cup chopped green bell pepper (I used about 1/2 cup peas)
1 (6 ounce) can tuna, drained and flaked
1 cup sour cream (I used greek yogurt)
1 teaspoon curry powder (garam masala would probably work too)

1. Over medium-low heat melt butter in a large saucepan. Add garlic, onions and green pepper. Cook slowly, stirring occasionally, until onions are soft.

2. Stir in tuna, sour cream, curry powder, salt and pepper. Heat until warm and serve.

The main thing is not to heat the onions too fast so the cream doesn't curdle when you add it. That's all.