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1 cup (142g) all-purpose flour, plus more for rolling out the dough
1 tablespoon (9g) black sesame seeds
1 tablespoon (9g) white sesame seeds
1 tablespoon (9g) poppy seeds
1 tablespoon (10g) dried minced garlic
1 tablespoon (10g) dried minced onion
1 teaspoon kosher salt
½ cup (1 stick/113g) cold unsalted butter, cut into ½-inch cubes
1 large egg
2 tablespoons milk
8 ounces (225g) cream cheese, softened
½ cup (125g) plain Greek yogurt
4 ounces (125g) smoked salmon, finely chopped
2 tablespoons minced red onion
1 tablespoon fresh lemon juice
1 tablespoon capers
1 tablespoon minced fresh dill
1 tablespoon minced fresh chives
1 teaspoon horseradish cream
½ teaspoon kosher salt
¼ teaspoon freshly ground black pepper
10 ounces (280g) baby heirloom tomatoes in assorted colors, or substitute any colorful, crunchy vegetables you'd eat with a dip