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Put 0.5 ounces (14.1 g) of goat cheese in a bowl and use a fork to start separating and condensing it. Add 2 tablespoons (30 g) of plain yogurt and mix the combination together until it's smooth and the goat cheese is fully mixed with the yogurt. You can get crumbled goat cheese if you'd like and skip the step on mashing it. You'll still need to mix the ingredients together though. Grab 2 slices of whole wheat, rye, or multigrain bread. Set them out on a plate and use a butter knife to spread the cheese and yogurt evenly over 1 side of each slice. If your smoked salmon is pre-cut, you can simply layer it on top of one of the slices of bread. If it isn't cut, use a chef's knife to trim 1.25 ounces (35.5 g) of smoked salmon into 4-5 thin slices. Thinner slices are better than thicker slices, since smoked salmon can have kind of an odd texture in a sandwich if you bite into a big chunk of it. Run a cucumber under cool water to clean it. Set it out on your cutting board and hold it down with your nondominant hand. Use a chef's knife to slice 1/4 of the cucumber into 0.51 inch (1.32.5cm) slices. Add them on top of your salmon. Take a lemon and cut it into 4-6 slices. Squeeze the lemon juice over your sandwich to give it some citrus flavor. Sprinkle a pinch of salt and pepper over your sandwich. You can also choose to add more salt and pepper or skip it completely. It's all a matter of personal preference. Add your second slice of bread on top of the salmon and enjoy your sandwich! You don't have to use all of the lemon. You can squeeze as much lemon juice over the sandwich as you'd like. Chives and dill are popular toppings that you can easily add to your sandwich. Your sandwich will be good for 1 day after you've made it. It won't hold for much longer than that before the bread starts to get soggy and the yogurt sauce starts to go bad.
Mash your goat cheese with a fork and mix it with the yogurt. Spread the cheese and yogurt over 2 slices of bread. Add your smoked salmon to 1 of the slices of bread. Cut 1/4 of a cucumber into thin pieces and add them to your sandwich. Season your sandwich with lemon juice, salt, and pepper.