Slice onions into half moons.
Slice nectarines into quarter-inch thick wedges.
Heat olive oil – use enough to coat your pan. You can also use a large griddle for this recipe.
Once the oil is hot, add onions and nectarines. You can mix them all together, cook them side-by-side, or cook them in two batches.
Let them sit and sizzle. Resist the urge to turn, toss, or flip. They need to sit on the heat to caramelize – turn tasty brown. After several minutes, using tongs, carefully check to see if nectarines are browning. If so, turn them over. If not, wait for a few more minutes and check again.
Once they are all browned, remove from heat.
Serve immediately, or cool to add to salad.