Be sure to steam it in a rice cooker before baking — that's the secret to its chewiness.
Mix the whole wheat flour and yeast together.
Add salt and warm water, then knead the dough.
Let the dough rise for 1 hour.
Shape the dough into bagels.
Boil the bagels in boiling water for 1 minute.
Bake in a 180°C oven for 20 minutes.