Preheat oven to 150 C fan/170 C/325 F.: When you open the oven, you should sense a neutral warm air, not a blast of heat, which signals the oven reached the gentle setting needed for a bain marie bake. The lower, steady oven temperature ensures the custard sets slowly and evenly, preventing cracking or a rubbery texture. One tip is to place an oven thermometer inside if your oven runs hot or cold; inconsistent oven temps are the most common reason flans either overbrown or remain unset.
Quickly boil both carrots and peas in two separate pots of lightly salted boiling water.: You will hear a lively simmer and see bright color intensify as the vegetables blanch. Cooking separately preserves their distinct colors and prevents flavor transfer. The goal is tender but not waterlogged pieces, so test with a fork frequently. Avoid a rolling boil that breaks down the vegetables into mush and releases too much starch, which can change the texture of the purée.
Drain under cool running water, then pat dry.: The cool rinse stops the cooking and helps the vegetables retain vivid color, while patting dry removes excess surface water that could thin the purées. You want them moist but not dripping, as excess water makes it harder for the flans to set. A kitchen tip is to spread them on a clean towel and gently press, because overlooking this step often leads to a watery mixture and a floppy finished flan.
In a food processor blend cooked carrots until smooth, then add in half the ricotta and thyme, 1 tablespoon parmesan cheese, 1 tablespoon almond flour and 1 beaten egg. Season with salt and pepper and transfer into a bowl.: As the carrot purée whirls, you should notice a silky texture and a sweet, concentrated carrot aroma. Adding the ricotta cheese and the beaten egg creates a custardy base, while the Parmesan cheese and almond flour round out the flavor and assist setting. The reason for blending to smoothness is to avoid grainy bits in the finished flan. A common mistake is underprocessing, which leaves fibrous streaks and an uneven texture.
Clean the food processor and fold the cooked peas in, then add the remaining ricotta, almond flour, parmesan, thyme and beaten egg. Season to taste.: After puréeing, you will smell the sweetness of the peas and notice a fresher, greener scent compared to the carrots. Folding rather than overprocessing keeps a little texture and maintains color. The remaining ricotta cheese and egg give the pea layer its own custard identity. Over-blending the peas can turn the mixture pasty and cause loss of that lively green hue, so stop as soon as smooth and gently combine any additions.
Spray with oil a non-stick muffin pan and fill the molds by half with the carrots mixture. Fill to the top with the pea mixture.: Brushing or spraying the molds prevents sticking and also helps the edges brown subtly. As you spoon the carrot mixture, take note of the thickness and the way it glides, which indicates proper consistency. Filling by half gives the carrot layer room for the pea layer without overflow. Filling too full at this stage leaves no allowance for expansion, which can cause spillover into the bain marie.
Arrange the muffin-tin on a large roasting tray filled with hot water by 2/3, to make the bain-marie.: The final layering should look neat, with a distinct color split between orange and green. The pea mixture will settle into place and smooth easily with the back of a spoon. Keep the molds level as you transfer them to avoid uneven layers. A common pitfall is jostling the pan so the layers mix, which defeats the visual contrast of the dish.
Bake in the oven for about 30 mins or until set. Allow to cool slightly before removing the flans from the tins.: You should hear the gentle slosh of water and see steam rising lightly, which indicates a properly hot water bath. The bain marie moderates heat around the molds so the custard sets evenly without curdling. Use hot water rather than cold to avoid a sudden temperature shock that can alter baking time. Be careful when carrying the tray, as splashing water into the oven can change the oven temperature and the final texture.
Turn the flans upside down on a serving plate and serve. Enjoy!: You will notice a gentle wobble in the centers when they are done, with edges that feel set to the touch and a faint golden hue just at the top edge. The aroma will be a mix of warm herbs and sweet vegetables. Letting them cool slightly helps the flans firm and release cleanly from the molds. Opening the oven too often to check can cause uneven cooking, so rely on the wobble test near the suggested time.
Turn the flans upside down on a serving plate and serve Enjoy: As you invert the molds, you should see clean shapes with vivid layers, and the surface will feel warm to the touch. Serving immediately while slightly warm preserves the tender interior, and a light brush of extra virgin olive oil before plating can lend an attractive sheen. Avoid forcing them out if they stick, instead run a thin knife around the edge to prevent tearing the delicate sides.