Though normally thought of as a vegetable, the jalapeño chili pepper is a fruit.
It is relatively spicy, as the taste of a single pepper can be detected in 50 pounds of mild sauce.
i freeze them out of my garden at >=20 deg F and they hold up great.
Serrano Peppers are a reasonable alternative
Use green pepper. Very flavorable.
One general way to reduce the spiciness of a dish is to add sugar or another sweetener.
You can also add some lemon.
remove the seeds or incorporate sugar into the recipe.