Final answer:
The text provided does not directly answer what Ultima and Antonio ate by the river, but it includes various meal descriptions such as sandwiches for John and his companions, and a mention of partridges from a hunting trip. Coffee and brandy on the veranda also feature in the narratives.
Step-by-step explanation:
The text provided does not specify what Ultima and Antonio ate by the river, rather it draws from various contexts that describe different meals and settings. John, along with his companions, ate food brought by Jasmine, which includes sandwiches as mentioned in a neatly laid out picnic. In another setting, the character consumed coffee and brandy on the veranda, suggestive of a relaxed and refined atmosphere. Lastly, there's a mention of a day spent hunting, with a bag full of partridges, indicating a hunting bounty. Each passage paints a picture of the landscape, ambience, and the fellowship around meals, creating a mood or feeling rather than delivering mere facts about the food.