The SP plan focuses on eating low energy denisty foods.
To follow a true SP day you need to avoid pasta, rice, potatoes, and any syn free foods that don't have an S or P next to them in your SW Food Optimising book (or on the website!)
You still get your 5-15 syns a day, and they can be used on whatever you like, as normal. For example, you can't have any syn free yogurts, but you can use your syns to have a yogurt if you wish.
You also get 2 hex b choices to use.

Butternut squash chips! Must try x

I really rate cauliflower rice and courgetti actually. Obviously not as good as the real thing, but cauliflower rice especially is a great substitute. And my courgette spiralizer is great fun. You can buy cauliflower rice ready 'riced' in Tesco if you're feeling lazy. Think they call it cauliflower cous cous.

Cauliflower is easy enough to do yourself, I just throw it in the blender (plus it's cheaper lol)
There's quite a few thing like this in Tesco, they're now doing a Rainbow Vegetable Cous Cous, and Butternut Squash Spaghetti too.

I've found a new love of roasting too! With it getting colder I love sticking a load of speedy veg in for an hour (courgettes especially!) and voila! SP but still a winter warmer. The recipes on the website are fab too!