To prepare the dressing, combine olive oil, vinegar, sugar, and soy sauce in a jar and shake until the sugar dissolves.

Melt butter in a large skillet over medium heat. Crush ramen noodles while still in the package, remove seasoning packet, and discard. Add noodles, almonds, and sesame seeds to the melted butter.

Saute the noodle mixture, stirring frequently, until golden brown. Remove from heat and cool on a plate.

Shred Napa cabbage and slice green onions. In a large bowl, combine cabbage, onions, and noodle mixture. Pour dressing over the salad and toss to combine. Garnish with additional green onions if desired and serve immediately.