I agree with AndBreathe that the time to test individual foods to see how they work for YOU is to test more regularly than once a day.
The general advice is to test before eating, then 2 hours after. If the blood glucose level has risen more than 2mmol/l in that time, then something you ate was too carby. There are several options - avoid the food completely, reduce the portion size, or swap the ingredients for things that are more blood glucose friendly.
If you just test once a day, it is a bit like pinning the tail on a donkey since blood glucose can rise and drop steeply in an hour.
Are you getting free prescriptions? The reason I ask, is that there are a lot of different prices for the blood glucose meter test strips. Many of us on here use the cheapest ones we can find and so far, I think the SD Codefree is the best deal. I can buy a pot of test strips for about £7 with free P&P
which is actually less than the cost of paying for a prescription (if you pay for them, as I do). You can get discounts for multiple purchases. I find that a very compelling argument for buying my own, using them whenever I want, and not having the hassle of submitting repeat prescription requests and running backwards and forwards to the surgery and the pharmacy. Any meter will tell you the info you need, the trick is to find one at the price you can afford to use often enough to get the info you need.
Sorry if this sounds like a product placement

but really, it kind of is. I think that we T2s do best if we Eat to Our Meter (avoid foods that our meter identifies are bad for us), and the only way to do that is by extensive testing. Once we have done that, and know how our body reacts to our food choices, and we have tailor made our diet to suit ourselves, then testing becomes much less important, and a daily or even less often check becomes all that is necessary.
Hope that helps.