Boxing Day Bubble and Squeak | Guest Recipes | Nigella's Recipes | Nigella Lawson

Ingredients

• 75 grams diced pancetta bacon or ham (optional)
• butter or flavourless oil (for frying)
• 2 spring onions white parts diced, green parts sliced, separated
• about 400 grams leftover roast potatoes and roast vegetables
• about 125 grams leftover greens or cabbages (shredded)
• 4 - 6 eggs
• freshly made Hollandaise Sauce
• finely chopped chives and/or flatleaf parsley (to sprinkle)
• salt
• freshly ground pepper
• 250 grams salted butter (cut into small pieces)
• 4 egg yolks
• 4 teaspoons lemon juice (plus more as needed)
• 1 teaspoon white wine vinegar (plus more as needed)