Heat up oven to 350°F, sprinkle ground garlic on fish and place fish fillets on sheet pan (might want to put a little olive oil or spray oil so it wont stick to the pan)-Fish might take about 10-15 minutes.
While fish is cooking, in a pan heat up the olive oil, once hot combine cabbage, green onions, jalapeño and salt on pan.
Let the vegetables cooked, once cooked, add fish (taken out from oven) and while mixing it, smashed the fish into small pieces.
Now the tacos can be eating, in three different ways: eat with warm corn tortilla, make your own taco shell by cooking the tortilla on hot oil, or buy taco shells already done. I prefer just to warn up the tortilla to make healthy conscious.
Place veggie/fish mix in tortilla and top with tartar sauce.