How to Make It
In a medium saucepan, cover the potatoes with water and bring water to a boil over high heat. Boil for 5 minutes. Drain and let cool, then cut the potatoes in half.
In a very large skillet, heat the olive oil until shimmering. Add the potatoes, cut side down, and fry over moderately high heat until golden, about 3 minutes. Turn the potatoes and cook until browned in spots, about 2 minutes longer. Add the corn kernels and jalapeño and cook, stirring occasionally, until the corn is crisp-tender, about 3 minutes. Gently stir in the salmon and scallions and cook until just heated through, about 2 minutes. Season the hash with salt and pepper, sprinkle with the basil and serve.