Higher blood glucose after breaking a fast?

Have read that the best foods for breaking a fast is really low carb, eg salmon/tuna and salad. Have also read that sometimes, if you're new to fasting your pancreas can go into panic mode thinking you're starving, just like it does re the 'dawn phenomenon'.

Over the past 6 months I've been on keto, my pancreas appears to have settled down somewhat and that 'dawn phenomenon' isn't now much different from my bedtime BG reading.

I have to assume that you are only testing before a meal and then 2hrs after 1st bite - tests before that point aren't much use, since even non-diabetics get large spikes in BG, just that they don't last as long. Some of us Type 2 's are more carb sensitive in the mornings than in the evenings and for others it's the other way around.

I often find my highest BG is before I break my fast (both when eating 2 meals a day and when eating 1 meal per day).
I eat low carb 20gms to 40gms per day, so before I eat my BG is all coming from my liver - not my food.

Dawn Phenomenon is still quite a large factor for me despite being 'fat adapted' and in remission for nearly 4 yrs.
It's when I eat a low carb meal that my liver decides I don't need any more glucose to keep me fueled.

The actual number is not as important as the difference between pre meal and 2hr results.
Many of us experience rising blood sugars until we eat, our livers taking the opportunity to get rid of some stored glucose, so it would follow that if lunch is your first meal , you could be starting from a higher level than you are at dinner.
Other possible reasons are that your lunch has more in the way of carbs than your dinner, and for some reason we seem to be more insulin resistant earlier than later. Don't understand why that would be but things seem to have less of an impact on my levels later on in the day.

As others have said, sounds like dawn phenomenon is at play. Ian's suggestion of a small, low carb snack is the only consistently reliable "fix" I've found works to halt it, although my dawn phenomenon is increasingly inconsistent and doesn't cause a continuous rise every time when fasting. My layman's understanding is that our bodies perceive an empty stomach as "will be going out to hunt soon and might have to fight off sabre-tooth tigers on the way", so your liver primes your body with the glucose it needs for energy. On the one hand, your BG increases, but on the other then if you have a fatty liver then it's pushing your liver to use its stores - as with many diabetes issues, swings and roundabouts!