The pro behind these ideas: Jenny Rosenstrach, the master of simple, low-stress cooking. You might know her from her blog, Dinner, A Love Story; her new book, Dinner: The Playbook, is full of the same secret strategies for busy women. Here, she's sharing little tricks that will make you look like a total chef. You could buy all these items bottled, "but I find it very hard to replicate the brightness of a from-scratch recipe," says Rosenstrach. A homemade vinaigrette: "I always say, if the dressing is the only thing on the plate that's homemade, your meal is still going to sing," says Rosenstrach. In an old jam jar, add 1/2 tablespoon of Dijon mustard, 1/4 cup cider vinegar, 1 teaspoon honey, salt and pepper, and a squeeze of fresh lemon juice; shake. Add 1/2 cup extra-virgin olive oil, and shake again. Serve, and keep the rest in the fridge. Your own marinade: "Marinating is your best friend," says Rosenstrach. "It makes the end result so much more flavorful." Take any extra herbs left in your fridge at the end of the week (mint, cilantro, tarragon, and dill are Rosenstrach's picks), and whirl in a blender with olive oil, yogurt,