I just baked a yeast bread that looks similar. It was enriched with eggs, milk, butter, beef tallow, cane sugar, molasses, some cumin, smoked paprika, and some pickled jalapeño brine. It's not spicy at all to me, but mam, is it good. I used a mix of bread flour, AP, medium rye, white rice flour (just about a teaspoon or so as my weights for the recipe made a very wet dough),and semolina. It was like store bought bread on steroids.