In a small bowl, combine the hot water and sugar until combined. Sprinkle the yeast on top and let it rest for 8-10 minutes until it's foamy on top (If there is undissolved yeast after 8 minutes, gently whisk and let sit for another 1-2 minutes).
In a large bowl, whisk together the flour and salt until combined. Stir in the water/sugar/yeast mixture using a spatula and mix until it starts to come together enough to handle. Sweep up any flour remaining in the bowl with the dough then place the dough on a clean and lightly floured countertop.
With lightly floured hands, knead the dough for 7-9 minutes until it's smooth and elastic, and not shaggy. The dough should be slightly tacky but not sticky. If it’s sticking to your hands, add a sprinkle of flour and keep kneading.
Wipe out the same bowl and lightly oil the bottom and sides. Cover the bowl with plastic wrap and place the bowl in a warm spot in your kitchen and let the dough rest for 60-90 minutes until it doubles in size.
Line an extra-large baking sheet (or 2 half sheets) with parchment paper, spray with cooking spray, and set aside. Gently punch down the dough and place it on a clean work surface (not floured). Using a bench scraper or knife, divide the dough evenly into 8 pieces (about 110-114g per piece). Now shape each piece into a ball, by cupping your hand around it and moving it in a circular motion on the work surface to form a tight ball.
With lightly oiled hands, press your thumb and pointer finger through the center of the dough creating a hole. Now, using your pointer finger and thumb from both hands, start gently stretching and widening the hole while rotating in a circular motion, creating a bagel shape (the hole should be about 2 inches in diameter).
Place on your prepared baking sheet(s) leaving 1-2 inches of room between each piece. Now cover it with a tea towel or plastic wrap and let it rest for 15 minutes (if the holes shrink a bit, you can gently stretch again before boiling).
Preheat the oven to 425 °F (220 °C) while the bagels are resting.
When the bagels are almost done resting, bring 10 cups of water and 3 tablespoons of brown sugar to a boil in a large pot (whisk if needed to combine). Add the bagels to the boiling water, 2-3 at a time, and boil for 30 seconds on each side. Use a slotted spatula to remove them and return to the baking sheet with the nice side facing up (ensure the water drains well before placing down). Immediately sprinkle with toppings while wet and gently press on them so they stick (don't press the dough in).
Bake until golden brown, approximately 18-22 minutes, or until golden (rotating the pan(s) at the midway mark). Transfer to a cooling rack for 10-15 minutes.