1&1 mealplan question

While I don't have problems eating plain food myself, I'd probably go mad if I had to eat plain chicken and broccoli (and the like) every second day. I'd say it depends on what kind of sauces you have in mind. Ranch dressing? Probably not (not that I know what ranch dressing even is). Ketchup? Maybe look into making one yourself. Oil and vinegar? Don't see the harm in it as long as it's within reason and you use a good oil (olive maybe. Seed oils, maybe not).
What you can try is seasoning. Most meat and fish tastes already pretty good with salt and pepper. Vegetables, try soy sauce, or aceto balsamico. Cook rice, lentils and quinoa in (good) broth. If you try something with oil, try making a sort of marinade with a table spoon of oil, add spices or garlic and toss your vegetables into that (after cooking), swish a bit around and drain.
It also would be interesting why you can't eat plain food, exactly. If you just don't like it, I guess man up and do it anyway (as harsh as it sounds) and look forwards to the free pass days.

Or, different idea if you can't eat plain food: Eat nothing but unsalted potatoes for a month. While I have no idea to the merits of something like that, I've read some broscience about a guy (or several? Don't remember) who did that and not only did they lose some weight in the process, they also were able to taste a lot more after that and had a complete new relationship with food.
Here's an article I spontaneously found.

Honestly, though, I think counting calories is much easier and still gives you the chance to eat what you like. But then again, I like crunching numbers, so your mileage my vary.

Edit: Maybe this helps you find some sauces and dressings to add to your meals
This is going to be my last edit. I've already did that too much already.

If it helps i am using for about a week 1&1 mealplan i use half a spoon of olive oil on vegetables on control/limit days and its ok for me but i think the idea is to be as basic as possible on control/limit days but a half a spoon of olive oil or some sauces wont hurt btw i eat plain food on control days and its ok only vegetables are not that good plain like salad and corn salad it fells like im a cow on a ranch so i use a little bit of oil.Like it says you should enjoy the food the next day on control days be as basic as possible.

So I was kinda took aback by Nihopaloa telling me to man up but I guess I really have to actually man up. It's not that I don't like basic food, I could eat toast and butter all day it's as Setsti says, vegetables and root vegetables and even meats and most fish without some kind of flavouring is hard to eat.
For example, I don't like steak but my brother made steak pieces in the oven with buttery mash (about 10g butter per 2 potatoes) with onion gravy and I loved it. Or I can't eat plain chicken without mayonnaise or something to pick up the flavour.
I can eat vegetables with a bit of spicy dressing or something simple like that as I love spicy food.