Boil the potatoes until tender fork tender and drain.
Heat a griddle or large cast iron frying pan with a drizzle of olive oil.
Place the quartered potatoes, sliced onion, garlic and jalapeño on the griddle to grill and become golden, turning over once or twice to become golden on both sides.
Combine the vinegar, brown sugar, seasonings and olive oil and stir. Drizzle this mixture over the potatoes a few minutes before taking the potatoes off the grill.
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