Boiling or steaming frozen vegetables often leaves them soggy and bland, but a splash of olive oil and an oven can transform them into a crispy, caramelised side dish. As frozen vegetables thaw, they release water, and boiling or steaming adds even more moisture, which strips away natural sweetness and water-soluble nutrients.
Why roasting beats boiling
Roasting frozen vegetables in olive oil allows excess water to evaporate quickly, helping them cook evenly and brown. This process caramelises natural sugars for a golden, crispy finish while the oil adds depth of flavour and helps seasoning cling to the vegetables.
Water-soluble nutrients are lost during boiling or steaming, but using olive oil helps the vegetables retain their nutritional value while drying out quickly and tasting better. Roasting requires just five to ten minutes of effort, with no need to stand over the pan.
How to make tastier frozen vegetables
You will need one bag of frozen vegetables (around 500g), two tablespoons of olive oil, one teaspoon of garlic powder, one teaspoon of smoked paprika, and salt and pepper.
Preheat the oven to 220°C and heat a tray inside for five to ten minutes. A hot tray helps moisture evaporate quickly so the vegetables crisp up, while a cold tray leaves them sitting in their own water. While the tray heats, place the frozen vegetables in a large bowl and add the garlic powder, smoked paprika, salt and pepper.
Drizzle the olive oil over the vegetables and mix with a large spoon until thoroughly coated. If you prefer fewer dishes, season directly on the hot tray, but work swiftly to avoid burns and heat loss.
Cooking time and finishing touches
Once the tray is hot, remove it with oven mitts and spread the vegetables in a single layer, leaving gaps around larger pieces. Cook for 20 minutes, then turn them over and cook for a further 10 to 15 minutes.
This method takes slightly longer than boiling or steaming, but the result is perfectly crisp vegetables with a caramelised appearance. For extra flavour, finish with parmesan cheese, a squeeze of lemon juice or a pinch of chilli flakes.
