Pizza, Burger, Pasta etc......

It might help if you could fill in your profile so people know what Type diabetic you are, and also what medications you are on.
The type and meds can distinctly change the answers that you may get.

I do eat what I want and I do have great control. You have to learn how to dose for yourself as we can all be so different.

But a potato or spaghetti (vegan everything for me) I dose half my bolus (prebolus) about 30 minutes before I eat and the rest when I eat. This is what I do with almost all the "normal" food I eat. Give or take on timing depending what blood sugar level I am starting at. But timing is the trick for me to keep my blood sugar levels fairly stable.

My entire pizza is easier because of being a vegan, even long time T1's say they have trouble with pizza, they still eat it but it's harder to dose for because it's high fat, high carb. The fat delays the carb absorption. For me I have my insulin dose divided in threes in this case, a third a half hour before, a third when I eat and a third a half hour after. It took some experimenting to figure it out. But my pizza is lower fat than a regular pizza. Some Type 1's talk about taking an correction bolus even hours after they eat.

I can't help you at all with the burger! My vegan burger and veggies on sprouted whole grain bun is probably far different than a regular burger.

I just had 78 g carbs, 58 g protein, 18 g fats in a rice salad and vegan sausages. I took a prebolus about 20 minutes before I ate, with the rest when I ate. I eat the rice salad all the time, the sausages were new. I dropped sooner than I expected and ended up eating some pineapple when I wasn't hungry. I think because it ended up higher fat and higher protein with the sausages and it slowed down the carb digestion. It will always be a learning experience, but experience and trial and error is how you figure it out.

A Libre really helps in figuring out dosing easier, I would suggest trying to get one!