Preheat the oven to 200°C (400°F).
Spread the Serrano slices out on a lined baking tin.
Bake for around 8 minutes til golden brown.
Allow to cool.
Dice the red onion, chicken, cucumber, cooled Serrano ham, and grape tomatoes. Chop the gem lettuce.
Mix the cold rice and all the chopped ingredients on a platter.
Whisk together the ingredients for the dressing: crème fraîche, Dijon mustard, garlic cloves, maple syrup, chopped mint leaves, and lime juice. Add sea salt and pepper to taste.
Pour the dressing over the salad. Mix and season to taste. Let the dressing sit for 10-15 minutes before serving.
Serve.