Instead of going out to the supermarket and spending up large on out of season produce, try substitute those ingredients for something in your refrigerator or in season cheaper produce. 

Here's a guide to some ingredients that can be substituted for one another. 

Hearty Green Vegetables:
- Broccoli
- Green Beans
- Snake Beans
- Broccolini
- Peas
- Asparagus
- Cauliflower

Carb based vegetables:
- Potatoes
- Kumara
- Pumpkin
- Squash
- Butternut pumpkin