In a large pot, bring water to a boil. Add the chopped cabbage and potatoes. Cook until the potatoes are tender and the cabbage is soft, about 15-20 minutes. Drain well.
In the same pot or a large mixing bowl, mash the cabbage and potatoes together until well combined. Set aside.
In a large skillet, heat the olive oil over medium heat. Add the chopped bacon and cook until it is crispy. Remove the bacon with a slotted spoon and set aside, leaving the bacon fat in the skillet.
Add the minced garlic to the skillet with the bacon fat and cook for about 1-2 minutes, until fragrant and lightly golden.
Add the mashed cabbage and potatoes to the skillet with the garlic. Stir well to combine and press the mixture down into the skillet to form a thick pancake.
Cook over medium heat until the bottom is golden brown and crispy, about 5-7 minutes. Carefully flip the mixture (you can use a plate to help flip it) and cook until the other side is golden and crispy.
Transfer the trinxat to a serving platter. Sprinkle the cooked bacon over the top and garnish with freshly chopped parsley. Serve hot.
Enjoy your meal!