I roast the squash first we like it smokey and sweet! Also if you can get it and are not veggie, if you can get some black forest ham (lidl), roll it up and cut it into really thin shreds and fry it that makes a really good garnish
Also parmesan crisps ...also not really veggie, but delicious! Grate the cheese finely and put it evenly (about a pudding spoonful) onto a non stick tray and into a hot oven, the cheese will melt out into a lacey cracker that is just the best crisp, cheesey salty goodness!
If you want them to be perfectly round then use a pastry cutter as a stencil on the tray, sprinkle the cheese inside it and lift the cutter carefully .