Ratatouille and Potato Gratin Recipe: Easy Summer Dinner 2026

The ratatouille and potato gratin recipe from Rachel Roddy is a perfect way to celebrate summer vegetables while using an air fryer for extra convenience. Inspired by Jane Grigson and Robert Carrier, this dish combines tender aubergine, courgettes, tomatoes, and herbs with a creamy potato layer.

Why Air Frying Makes Ratatouille Better

Cooking the aubergine separately in an air fryer ensures it holds its shape and develops a rich, caramelized flavor. Deep-frying is tastier, but air frying offers a healthier alternative without sacrificing texture. Simply toss diced aubergine with olive oil and salt, then air fry at 200°C for 12–15 minutes until golden.

Key Ingredients for Success

Use ripe summer produce: berries, cherries, peas, runner beans, but especially potatoes, aubergines, courgettes, tomatoes, and herbs like thyme and basil. The quality of tomatoes determines the sweetness—taste them raw and adjust with a pinch of sugar or red-wine vinegar near the end of cooking.

Step-by-Step Method

Start by sautéing onions and garlic in olive oil. Add diced courgettes, then tomatoes and herbs. Simmer covered for 10 minutes, then uncover and cook until the liquid reduces. Meanwhile, air fry the aubergine separately and fold it into the stew. For the potato gratin, layer thinly sliced potatoes with cream, garlic, and cheese, then bake at 180°C for 40 minutes until bubbly.

Tips for Perfect Texture

Stir the stew deeply to prevent vegetables from clumping and sticking to the pan—remember the Provençal term ratouiller meaning “to stir up the mud at the bottom.” A final lively simmer ensures any wateriness disappears, leaving a concentrated, rich ratatouille.

• Air fry aubergine separately for best shape and flavor
• Simmer covered first, then uncovered to reduce liquid
• Adjust acidity with sugar or vinegar based on tomato sweetness
• Layer potatoes evenly for a creamy gratin

FAQ

This ratatouille and potato gratin is a comforting summer meal that highlights the best seasonal produce. Whether you use an air fryer or traditional methods, the result is a hearty, flavorful dish perfect for family dinners or gatherings.