As much as I love the spinach and mushrooms in this lasagne, the red pepper sauce is the star of this dish. It’s my take on a sauce in Mildreds, The Cookbook, where it’s served with penne and boiled vegetables. Even if you don’t fancy cooking or eating lasagne right now, do give the sauce a try. I was instantly addicted, and a batch of this (divided into 4 portions) is now a staple in my freezer. 
To make the sauce lighter (and vegan), I use soy cream instead of the double cream they use at Mildreds. I’ve also adapted the recipe to fit whole tins and jars. It could just be me, but one roasted pepper or one tomato left in a tin usually ends up mouldy in my fridge. 
A note on pasta sheets: I’ve used shop-bought ‘fresh’ ones (eerily long shelf life, though) that don’t require pre-cooking. In my experience, whether or not you have to pre-boil lasagne sheets depends on the brand you use, and on the cooking time. I tend not to boil them first, even with dried ones, unless they are very thick.
Ingredients 
For the sauce – 1 onion, chopped – 1 celery stick, chopped – 1 carrot, peeled and grated (the one I used was 165 g, unpeeled weight) – 2 cloves of garlic, chopped finely – 400 g tin of whole tomatoes – 350 g roast peppers (I used a 465 g jar with brine, undrained weight), roughly chopped – 1 tsp (coconut flower) sugar – 1 tsp coarse sea salt – freshly ground black pepper – 250 ml soy cream You’ll probably have about 1/4 of the sauce left after building your lasagne. Fridge or freeze for later use. It will be like having money in the bank, believe me. For the lasagne – 500 g fresh spinach leaves (I always chop fresh spinach so it doesn’t clump together so much ) – 400 mushrooms, sliced not too thinly – lasagne sheets Preparation
– Preheat oven to 200°C – Start by making the sauce. In a large pan, fry onion, celery and carrot in oil until softened. – Add the garlic and fry for one more minute. – Add all the other sauce ingredients, except the cream. – Bring to a boil and then simmer, stirring regularly, for 20 minutes (lid off) – Stir in the cream and simmer for another 10-15 minutes. – Blitz the sauce with a (stick) blender and set aside. – Wash your pan and wilt the spinach in it. In a sieve, press out the excess moisture with the back of a spoon (or just squeeze with your hands). Set aside. – In the same pan, fry the mushrooms in oil (I use chilli oil here) until softened but not cooked through. Drain in a sieve. -Build your lasagne in a rectangular oven dish (the bottom of the one I used measures 16×25 cm). Start with a layer of sauce, followed by 1/4 of the spinach and mushrooms and lasagne sheets. Repeat until you’ve used up all your ingredients, ending with a layer of pasta sheets topped with sauce. – Cover the dish with aluminium foil and bake for 20 minutes. – Remove foil and bake for 10 more minutes. – Take the dish out of the oven and let it rest for 10 minutes before cutting into the lasagne.
The Vegetable Chopper 