Smashed New Potatoes with Peas, Lemon, and Pearl Onions Recipe | Food Network UK

Ingredients

• 1 1/2 to 2 pounds Jersey Royal potatoes
• Salt and freshly ground black pepper
• Extra-virgin olive oil
• 3 tablespoons unsalted butter
• 1 (10-ounce) box frozen pearl onions, defrosted
• Pinch sugar
• Splash freshly squeezed lemon juice
• 5 slices lemon
• 2 (10-ounce) boxes frozen peas, defrosted
• 1 lemon, zested
• 1/4 cup roughly chopped flat-leaf parsley
• 2 heaping tablespoons roughly chopped fresh dill
• 1 bunch watercress, stems trimmed