I can help with prawns and avocado. Avocado per half, 144 calories, 7.5 grams of carb and 13.3 grams of fat (by my calculator), I only mention the fat on avocados because it is high as are the calories and should be limited to half per serving and maybe only once or twice a week. Prawns per 100 grams, 66 calories and 1 gram of carb, fat negligible.
The roasted veg very much depends on what you have, i.e. red pepper, one medium 4 cals, 7.2 grams carbs. Pick your veg and the amount and put it into a calculator, myfitness pal, myfatsecret, sparkpeople etc, there a lots online if you Google it. The calc for the raw veg will change very little when you roast it but then you must count any oils you use. If you use pre-roasted veg then you will have to go by the packet.
As with all things on a diet it is worth working out what you are going to eat before you eat it and then decide how much is reasonable and what are your calories and carbs in total for the day. Sounds complicated but you get used to it and can keep a log of foods you eat over again. If you are unsure, as I was, follow a menu plan like the one in the book. Do you have the book, if not, get it.
Don’t forget yourself. Weigh AND MEASURE yourself on Monday morning.
Good luck