How to Make It
Season the chicken livers with salt and pepper. In a large skillet, heat 1/4 cup of the olive oil. Add half of the livers and cook over moderately high heat, turning once, until just barely pink within, 6 minutes. Transfer the livers to a bowl and repeat with the remaining livers and 1/4 cup of the olive oil. Add 1 cup of the Marsala to the skillet and cook until reduced to 1/2 cup, 8 minutes.
Add the remaining 1/2 cup of olive oil to the skillet along with the butter. Add the onions and garlic and cook over moderate heat, stirring frequently, until softened and lightly browned, about 10 minutes. Add the capers, anchovies, sage, rosemary and thyme and cook for 5 minutes. Add the remaining 1/2 cup of Marsala and cook until nearly evaporated, about 5 minutes. Let cool.
Transfer the onion mixture and livers to a food processor. Add the crème fraîche and vinegar and puree until very smooth. Season with salt and pepper. Refrigerate until chilled.
Rub the toasts on one side with garlic, spread the chicken liver pâté on top, sprinkle with sea salt and serve.