Cook the potatoes in boiling water with the salt and vinegar. After 10 minutes of cooking, add the peas. Cook for another 3 to 5 minutes or until the potatoes are just done. Drain, shock in iced water, drain again and set side.
Heat the olive oil in a frying pan.
Cook the chorizo slices over medium heat until until they render fat.
Add the garlic sausages. Cook until the edges start to brown. Turn off the heat.
Add the onion slices, potatoes and peas. Toss to coat the potato cubes with the flavorful fat.
Pour in the mustard and honey. Toss to distribute evenly.
Add in some pepper and scallions, if using. Toss a few more times and serve.