In a small bowl, combine 4 tablespoon warm water, 2 tsp. active dry yeast. Stir and let sit for 5–10 minutes until foamy.
In the bowl of a stand mixer, combine the bloomed yeast mixture, agave, poolish, flour, water, apple cider vinegar, sea salt, vital wheat gluten, and oil.
Knead until smooth and elastic. Mix 3 min on low, and 5 min on medium with a mixer, or 10 min by hand.
Gently fold in the cooked wheat berries, seed blend, and grain blend. Don't forget to reserve some for topping.
Place the dough in a lightly greased bowl. Cover with plastic wrap or a clean towel and let rise at room temperature until doubled in size, about 45 minutes depending on your kitchen temperature.
Turn the dough out onto a lightly floured surface. Shape it into a tight loaf. Moisten the loaf with water by rolling it on a damp paper towel. Next, roll the dough into a baking dish filled with the seeds and grains that you set aside or the topping. Place the loaf into a greased 9.5" x 5.5" loaf pan. Cover and let rise again until the dough rises just above the top of the pan.
Preheat your oven to 375°F (190°C) while the dough is finishing its second rise.
Bake for 35–40 minutes, until deep golden brown and the internal temperature reads 205°F.
Remove from the pan and cool the loaf on a wire rack for at least 1 hour before slicing. This helps set the crumb and prevents it from becoming gummy inside.