Cut each zucchini in half lengthwise, then cut 0. 33 inch (1 cm) deep around the inside edge of each half, leaving a 0. 25-inch (6 mm) shell.
Using a spoon, scoop out the loosened pulp, scraping and sculpting to leave an even 0. 25-inch (6 mm) shell, then coarsely chop the pulp and squeeze it in a clean tea towel to extract all moisture.
Sprinkle the inside of the zucchini shells with salt and place them upside down on paper towels to drain while you prepare the filling.
Heat 3. 0 tablespoons (45 ml / 1.5 fl oz) of the butter or oil in a 2. 1-quart (2-liter) pan over moderate heat.
Add the dry zucchini pulp and minced green chilies and fry until the mixture is softened and completely dry.
Add the kasha to the pan and continue to fry for 2. 0–3. 0 minutes until the grains are toasted and fragrant.
Add the chopped herbs, boiling vegetable stock or water, pepper, saffron, and salt to the mixture.
When the liquid begins to boil, cover tightly, reduce the heat to very low, and cook for 25. 0–30. 0 minutes.
Remove the pan from the heat, fluff the grains with a fork, and gently fold in the 0. 5 cups (120ml) of sour cream or cream cheese.
Dry the inside of each zucchini shell with paper towels, then spoon the buckwheat stuffing into each half, distributing it evenly.
Warm the remaining 1. 0 tablespoon (15 ml / 0.5 fl oz) of butter or oil and brush it over the top of each stuffed half.
Sprinkle the boats with sliced almonds and a touch of paprika, then place them in a single layer on a rack inside a baking dish.
Pour water into the bottom of the dish until it is 0. 25 inch (6 mm) deep to keep the zucchini moist while baking.
Bake in a preheated 350°F (180°C) oven for 20. 0–25. 0 minutes until the zucchini shells are fork-tender.