Heat 1 tablespoon of the oil in a large, preferably ovenproof skillet over medium heat. Add the onion and cook until softened, about 3 minutes. Add the garlic and jalapeño and cook for 1 minute. Remove from heat; let cool.
In a large bowl, combine the pork, bread crumbs, egg, salt, pepper, cumin, and onion mixture. Shape into 12 meatballs.
Wipe out skillet, add the remaining oil, and heat over medium-high heat. Brown the meatballs on all sides, about 7 minutes total. If not using an ovenproof skillet, transfer the meatballs to a baking dish.
Pour the salsa over the top. Bake until cooked through, about 25 minutes.
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