Littleneck Clams with New Potatoes and Spring Onions

INGREDIENTS

• 3 olive oil
• 4 smoked Spanish chorizo, cut into 1/4-inch pieces
• 1 1/2 small new potatoes, sliced 1/4-inch thick
• 1 bunch spring onions or scallions, whites halved and sliced; greens sliced on a diagonal, divided
• 4 garlic cloves, thinly sliced
• 1 dry white wine (such as Sauvignon Blanc or Pinot Gris)
• 5 littleneck clams, scrubbed
• Toasted bread (for serving)