Cauliflower mash is a good sub for taters- just cook till soft & mash, season & top with some fresh herbs & a splash of EVOO if you must. Can you have asparagus? If so make soup - a little onion & garlic sweat a bit season how you like (I like S & P, dried mustard, red pepper flakes or cayenne) add asparagus cut in small/tiny pieces sweat a minute or two cover with H2O maybe an inch over veg & simmer covered ~20 mins. Cool slightly & put in blender to smooth or if you have an immersion blender use that. I finish with a squeeze of lemon & fresh chives. Sometimes I add some raw rice with the asparagus just a scoop will add body once blended. I've also added boiled egg both before blending or chopped as a topping when serving - think sort of like hollandaise.