In a large, wide Dutch oven or sauce pan, melt ¼ cup of the salted butter with the olive oil over medium-high heat.
½ cup salted butter, ¼ cup extra-virgin olive oil
Add the onions and cook, stirring, until soft and translucent, about 4 minutes.
2 medium onions
Season lightly with salt.
½ teaspoon Kosher salt
Add the white wine and cook, stirring and scraping the bottom of the pan, until mostly evaporated, about 2 minutes.
½ cup dry white wine
Add the rice and cook, stirring constantly, until the grains are well coated and lightly translucent at the edges, about 2 minutes.
2 cups Arborio Rice