I've just falafel'd in a tray bake stylee and can also confirm it's good with a few chopped rashers of bacon added in at the onion and carrot frying stage
Boiled new potatoes (or potatoes parmentier) are another staple of mine when I have to do (gluten free) lunchboxes. With the former you can use a few dollops of chutney/pickle as an alternative to mayonnaise for lubrication. Spinach works well as a green leaf that can be eaten raw or chucked in with stuff that's going to be microwaved.
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For snacks, I've been experimenting with variants of this recipe for energy ball type things (having found the flapjack recipe I was initially following waaaay too sweet for me, and subsequently having taken top tips from peliroja and things like this:
http://dietitianwithoutborders.com/homemade-nakd-cocoa-orange-bars/).
Oven on at 175 centigrade
Line a tray with greaseproof paper
Soak 200-250g of stoned dates in boiling water for ~10 mins then drain. (Basically one of the packets you can get from the supermarket.)
Chuck about the same weight of cashew nuts in a blender and show no mercy.
Add in the dates and mulch it all together.
Add in the following:
100g of oats
50-100g of coconut oil (they don't seem to suffer too much without it. I'm using coconut oil because of lactose intolerance, but you could probably use butter)
a dessertspoon of peanut butter
Then your extras.
I'm using ~30g candied orange peel
~30g of crunchy banana chips
A couple of teaspoons of cocoa powder
A bit of sea salt if you're using them as a ride snack
Blend it all up then tip the thick, gritty paste into the baking tray and press it down.
Bung in the oven for about 10 mins, taking it out just as the corners are starting to go a bit crispy.
Wait for the mixture to cool down enough to handle, then squidge spoonfuls up in your hands to make mouth-sized balls, which can then go onto a plate to cool down properly.
They're sweet-ish enough to keep me off the chocolate bars and filling enough that 3 or 4 are a decent snack. Moreish enough that you might not stop at 3 or 4... I've been working away from home for the last 10 days and a tub of these lasted me for the first week or so.