I got Wendy to make the Birthday Cake for the random request, and got the Meat Pie and Meat Burrito from giving Wendy the inventor role. You need the recipes from all the storyline cook books from the house and Diner to make the Fish Pie.
Just go from top to bottom, making food only, you don’t need to make drinks like tea and coffee.
The locations of ingredients is random each game, so you will have look everywhere you expect to find them.
You’ll need to finish Christophe’s story to get Firmware level 3 to access Train Crash carriages which contain food items, and the ships along the bottom and near the lighthouse which have open containers inside.
Getting Maggies story done upto the point you make trip-wire, you will be able to make the Snowmobile which will make going around the Void to look for the containers and houses.
Have Blane to go out hunting to get the Deer and Bear ribs as well as Animal Fat, you’ll find candles on shelf’s with the food in gas stations.
There are a couple of container docks along the coast down south with a few containers dotted about, you can find salt inside salt boxes at Substations down south, as well as inside the Parking Lots, east of the Church near a Gas Station, and to the south of the Suspension Bridge. This Parking Lot will have a row of open and locked containers stacked up.