Saute the jalapeno slices in the peanut oil in a wok or pan.
add onions and cook for about 2 minutes on medium heat.
add diced mangos and cilantro and cook for an additional 3-5 minutes. Do not over cook the mango - basically cook them until they turn form the bright yellow to a duller yellow. Add curry, salt and pepper. Move the pan of chutney to the side and move on to cooking the halibut.
Saute the halibut steaks in peanut oil with a teaspoon of shopped garlic. Cook until the halibut is about 80% done.
Add the chutney to the halibut pan and cover the halibut completely.