Chop scallions finely and set aside. Heat 4 tbsp butter in a large sauté pan over medium heat.
Once scallions begin to soften, add chopped garlic and stir. Cook for another 2 minutes.
Add all but one cup of your fresh spinach and cook until softened. Add chopped artichokes and combine. Then, remove from heat.
Let mixture cool for a few minutes. Then, add ricotta, shredded cheddar, lemon juice, and 1 1/2 tsp kosher salt. Stir.
Transfer mixture to an air-tight container and let cool in the fridge for at least 1 hour.
To make pie dough, combine flour, 2 tsp kosher salt, and 3 1/2 sticks unsalted butter, chopped and cold, in a large bowl.
Work the butter into the flour with your hands or a dough cutter until the mixture is sandy and crumbly.
In a blender cup or food processor, blend 3 eggs with 3/4 cup of the reserved spinach and 2 tbsp ice water until bright green. Strain egg mixture through a fine sieve into the flour mixture.
Combine the flour and green egg mixture until a dough forms and there are no clumps of flour left. Work into a thick square and wrap in plastic wrap, chilling in fridge for at least 1 hour.
When ready to roll your pie dough, flour your work surface generously. Let your dough warm for 10 minutes, then roll into a large rectangle, about 32" x 24".
Cut 20 equal leaves, using your first leaf as a stencil. You may have to re-roll your scraps to create extra leaves.
Place a generous dollop of spinach and artichoke filling on half of the leaves. Then, place another leaf on top of each, pressing down around the edges to crimp.
Place leaves on 2-4 baking sheets (you can bake in batches) and chill them in the freezer for at least 15 minutes. Preheat oven to 375°F.
Blend the last egg with the rest of your spinach leaves (about 1/4 cup) and brush each hand pie with the green egg wash.
Bake for 20-25 minutes until each hand pie is crisp, golden on the bottom, and has subtle golden spots on top.