How to fix your food price
You can fix your food price based on cost estimation.
You can just calculate how much will it cost for you to make meal for one person.
While calculating the cost, make sure you include all the ingredients that you add in the meal.
Once you calculated your meal costs, then you can add your profit margin.
Generally, a profit margin of 30 to 40% is recommended for sellers selling Food from home.
If you find it difficult to calculate the pricing...
..then have a look at the other sellers that are doing good.
And follow their pricing and change it accordingly to your needs.