Initially I had thought to also sketch out the onboarding screens to show my users but I thought they may lead them on a little too much and I wanted to test the concept, see if it was communicating effectively and if it was meeting the user need I was aiming for.
These were the sketches shown to my users:

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The questions I asked were:
What do you think you can do in this app?
How would you use it?
When would you use it?
I started off with these three questions but ‘How would you use it’ became a bit redundant and was entirely replaced by ‘When would you use it’ by the end. Nonetheless I still got some responses with that first questions which is reflected in the answers collected below.
What do you think you can do in this app?
I think I can go to my fridge to check what's there, then go to the app and search based on that ingredient. It also looks like if I don't have one ingredient, then I can search for where my ingredient can be used instead which is a cool idea
I think you can use the food that you have in your fridge and perhaps use it in a way that differs from why you originally bought it. You can use it in a quick recipe, especially for people struggling with ideas or those who don't have a lot of time to cook. This way, they can ensure they use all the ingredients and not just part of them for one recipe.
search for recipes by specific ingredients