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1
Blend together flour, butter, and salt in a bowl with your fingertips or a pastry blender (or pulse in a food processor) just until mixture resembles coarse meal with some roughly pea-size butter lumps. Drizzle 5 tablespoons ice water evenly over mixture and gently stir with a fork (or pulse) until incorporated. Squeeze a small handful of dough: If dough doesn't hold together, add more ice water, 1/2 tablespoon at a time, stirring until incorporated. Do not overwork dough, or pastry will be tough.
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2
Turn out dough onto a work surface and divide into 4 portions. With heel of your hand, smear each portion once or twice in a forward motion to help distribute fat. Gather all of dough together, with a pastry scraper if you have one, and form into 2 (5-inch) squares. Chill, wrapped in plastic wrap, until firm, at least 1 hour.
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3
Arrange flan rings on 2 parchment-paper-lined baking sheets. Roll out 1 portion of dough on a lightly floured surface with a lightly floured rolling pin into a 16- by 10-inch rectangle. Cut into 6 rough squares. Gently fit each square into a ring (do not stretch dough). Trim excess dough flush with rim. Lightly prick each shell several times with a fork and chill until firm, about 30 minutes. Repeat with remaining dough and rings.
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4
Preheat oven to 375u00b0F with racks in upper and lower thirds.
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5
Line shells with foil (not heavy-duty) and fill with pie weights. Bake until sides are set, about 20 minutes. Carefully remove weights and foil and bake shells until golden-brown all over, 5 to 8 minutes. Cool completely on baking sheets on racks, then remove flan rings.
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6
Reduce oven temperature to 350u00b0F.
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7
Cook haricots verts in salted boiling water until crisp-tender, about 3 minutes. Drain and divide among 4 tart shells along with tomatoes, then top with a round of cheese.
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8
Cook shallot in 1/2 tablespoon oil in a small skillet over medium heat until softened, about 1 minute. Transfer to a small bowl. Heat remaining tablespoon oil in skillet over medium heat, then cook bread, stirring, until golden. Toss croutons with shallot and divide among 4 tart shells. Toss crab with tarragon, zest, and cayenne and add to same shells.
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9
Cook scallions in oil in cleaned small skillet over medium heat until softened, about 1 minute. Stir in peas and warm through, then divide mixture among remaining 4 tart shells. Add pancetta to skillet and cook, turning once, until just crisp. Reserve pancetta.
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10
Whisk together custard ingredients with 3/4 teaspoon salt and 1/2 teaspoon pepper. Divide among shells. Sprinkle chives over goat cheese tarts and top pea tarts with pancetta.
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11
Bake tarts on baking sheets until custard is just set, about 20 minutes. Cool slightly.
