This is designed to be a low cost recipe. Heat a large saucepan with a lid over a medium heat. Add the olive oil and, once hot, fry the onion with ... add the peas and stir through.
Half-fill a heavy-based saucepan with sunflower oil and heat to 170C. The oil is hot enough when a tiny bit of batter added to the pan sizzles and floats. CAUTION: Hot oil can be dangerous.