Prepare the ingredients: Drain the cooked beans and lentils, mash them until smooth, and measure the flours into a large mixing bowl.
Mix the dough: Combine the warm water, instant yeast, honey, mashed legumes, olive oil, and salt. Gradually stir in the flour mixture until a soft, slightly tacky dough forms.
Knead the dough: Knead on a lightly floured surface for 8–10 minutes, until the dough becomes cohesive and smoother. Add extra flour sparingly.
Let it rise: Place the dough in a lightly oiled bowl, cover, and leave in a warm spot for about 60–90 minutes, until visibly expanded.
Shape the loaf: Gently press out large air pockets, shape the dough, and place it in a greased 8-by-4-inch loaf pan.
Rise again: Cover loosely and let the dough rise for another 25–40 minutes, until slightly puffed.
Bake the bread: Bake in a preheated 350°F oven for 35–45 minutes, until browned and cooked through. Check the center if needed.
Cool before slicing: Rest in the pan for 10 minutes, then transfer to a wire rack and cool completely before cutting.