Welcome aboard, caitriona . . . happy to meet you.
I can imagine your husband is wondering what the heck happened here, especially since he's in the very early stages. He prob'ly feels pretty good & if it weren't for that stupid number, he could easily deny there's anything wrong with him. This is a lot like quitting smoking; it isn't something you can do for him - he has to want to help himself. When I was diagnosed, I was thinking "I can do this - I can rein it in - no big deal". Unbeknownst to me, my dear sweet man was worrying that I might die too soon! (he's since gotten over that fear!

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If it's possible to test a little more often for awhile here at the beginning, I think you could do as Richard says - start finding out which foods actually raise his blood sugar. This is done by testing before eating, and again two hours later. After two or three tests of a given food, you can be fairly sure if it causes a spike or not, and place that food on either the acceptable list, or the avoid list. So sorry to have to tell you the whole darn menu has to be tailor-made to your husband, but different foods affect each of us so very differently! Like I can eat sensible portions of beans with no harm whatever, and yet other diabetics eat beans & their blood levels go to the moon.
You'll be able to adjust many recipes too . . . like your Natilla. The milk and the cornstarch are causing the trouble. What you can use instead of milk, is use heavy cream diluted with water. Instead of cornstarch, use one or two additional egg yolks for extra thickening. The first thing we diabetics have to learn is that protein and fat are good for us. It's the carbs that kill us. So ignore all the media blathering about how unhealthy fats are. The low-fat movement doesn't include diabetics. Diabetics can eat all the protein & fats they want without disturbing their blood levels. Obviously if weight is an issue, then portion control comes into play, but for maintaining blood sugar levels, don't try to avoid fats. So I think his Caesar dressing is prob'ly a good choice. If memory serves, Caesar dressings aren't overly sweet.
As you prowl around our forum, you'll run into recipes that have worked for others of us. If you let us know what some of his favorite foods are, we can work on making them acceptable for his blood levels. If he likes his meats breaded, you don't have to use flour or bread crumbs. You can substitute soy flour, almond meal or crushed pork rinds, and the outcome is every bit as delicious. I can say that because I've DONE it!
And if you're still reading this lengthy reply (!), there are a couple of other sneaky tricks that work for me: Dreamfields pasta and Olé Xtreme Wellness tortillas. Both of these are processed in such a way that they don't spike most people, and I've been able to find both products at Kroger's supermarkets.
Hang in there & don't lose heart . . . give him all the positive support you can muster, and if he wouldn't mind joining us himself, we'd be delighted to meet him!
Thank you for joining us and I hope you'll come often & chat lots!
take care,