Caramelized Onion Tart with beans

50 g butter 1 tablespoon olive oil 4 large yellow onions , sliced 1 garlic clove , crushed 2 eggs 2 egg yolks 50 g coarse grain mustard 142 ml double cream[...]

1 cup all-purpose flour 1/4 teaspoon salt 3 tablespoons vegetable shortening 3 tablespoons cold butter , cut into pieces 2 -3 tablespoons ice water 1 Prepare[...]