How to Make It
Roast the red bell pepper directly over a gas flame or under a preheated broiler, turning as needed, until charred all over. Transfer the pepper to a bowl, cover and let steam for 10 minutes. Peel and seed the pepper, then cut it into 1/4-inch dice.
Put the Swiss chard in a large colander set in the sink. Sprinkle 1 tablespoon of salt over the chard and rub it into the leaves with your fingers. Let stand for 1 minute, then rinse the chard and squeeze dry.
Heat 2 tablespoons of the olive oil in a large skillet. Add 2 of the minced garlic cloves and cook over moderate heat until fragrant, about 1 minute. Add the Swiss chard and cook, stirring, until tender, about 7 minutes. Add the roasted red pepper and cook for 1 minute. Transfer the vegetables to a platter and spread them in an even layer. Let cool.
In a medium bowl, mix the yogurt with the tahini, lemon juice and the remaining 3 minced garlic cloves. Season with salt. Spoon the yogurt sauce over the cooled Swiss chard.
In a small skillet, heat the remaining 1 tablespoon of olive oil. Add the crushed red pepper and cook over moderately high heat until the pepper begins to sizzle, about 10 seconds. Pour the pepper oil over the yogurt sauce. Sprinkle with the chopped parsley and serve.
Warm pita bread or lavash.