Halibut with seasoning

1 1/2 cups grape tomatoes , cut in half,crosswise 12 white pearl onions, blanched and peeled 1/4 fluid ounce olive oil grated lime, juice and zest of 3 -5[...]

3 lbs halibut, cut into pieces 1 extra large white onion, cut into rounds 2 large leeks , cut into rounds 1 pinch saffron 5 medium tomatoes , cut in rounds 2[...]