Sneaking food into other food. How sneaky are you?

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I have a brother who will not eat veggies except for peas and corn. The trouble is, he's diabetic and the body uses those two veggies like a carb, esp. corn that it uses like a grain. So my Mother had to sneak veggies into hamburgers, lasagna, spaghetti. But now he can't have much tomato sauce becaue he tends to have stomach problems if he eats tomato sauce more than once a week. I told the people who cook for him (he's got assisted living because he is 60 IQ and not stove or oven safe) to chop fine and hide things in his meat loaf. They make meat loaf about once a week for him. He also will only eat fruit from a can. For Thanksgiving, he did eat pumpkin pie. I made diabetic cookies using diabetic cakemix and carrot puree. So he probably got a little bit of veggies during the holidays. My husband doesn't normally care for corn bread, but he liked it this time, it crumbled less. Probably because it was corn flour instead of meal and I used yogurt because we didn't have any milk, so I used a tablespoon of yogurt, the rest of the measure for milk was water and I used a little baking soda in addition to baking powder. He loved it. He normally doesn't eat yogurt either. He told his brother that sweet potato pie was pumpkin pie. His brother wouldn't try sweet potato pie, but he loved pumpkin pie. So he ate the pumpkin pie that was actually sweet potato pie and loved it. I try to put dairy into everything because my husband will only have milk if it's in cereal and he only buys a little bit of cereal once a month. Also he works indoors all day so he doesn't get vitamen D in the winter time. So how sneaky are you and why? So what food had you put into other food that people have eaten?