Using a 2-inch round cutter, cut 16 rounds from frozen bread slices, discarding scraps. To prevent bread from drying out, cover with damp paper towels, or store in a resealable plastic bag, and let thaw at room temperature.
In a large nonstick saucepan, toast bread rounds over medium-high heat until light golden brown on both sides, approximately 2 to 3 minutes per side.
Using a large sharp knife, cut pastrami slices in half lengthwise.
Blot tomato slices with paper towels to remove excess juice.
Spread a layer of Avocado-Lemon Aïoli onto toasted bread rounds. On aïoli side of 8 bread rounds, layer arugula, a tomato slice, and a pastrami piece, folding to fit. Top with a bread round, aïoli side down. Secure with a wooden pick. Serve immediately.
Recipe by TeaTime Magazine at https://teatimemagazine.com/pastrami-avocado-tea-sandwiches/