Ingredients
- 700g Maris Piper or Charlotte potatoes, peeled and chopped
- 85g unsalted butter (divided use)
- 415ml whole milk
- 2 tsp Dijon mustard
- 2 Tbsp fresh rosemary, finely chopped
- ½ tsp sea salt, plus extra to taste
- 2 tsp rapeseed oil or extra-virgin olive oil
- 1 medium brown onion, finely chopped
- 225g chestnut mushrooms, sliced
- 120g frozen peas
- 120g fresh spinach
- 2 Tbsp...
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