In ekasana, the fruits and nuts that are generally taken are the simple, plain, fresh ones, within your one meal and according to your maryada / pachchakhkhān.

Generally acceptable fruits

• Apple
• Banana
• Orange / sweet lime
• Pomegranate
• Papaya
• Mango
• Grapes
• Pear
• Watermelon / muskmelon
• Guava, if fully clean and well checked
• Dates
• Raisins
• Tender coconut / coconut water, if your tradition allows

Generally acceptable nuts

• Almonds
• Cashews
• Walnuts
• Pistachios
• Dry coconut
• Chironji / charoli
• Makhana / fox nuts
• Sometimes sesame or similar dry seeds, if your family/guru permits

Keep in mind

• Take them plain, not salty, masala-coated, fried, or mixed.
• Use only clean, insect-free, fresh items.
• Follow your local Jain tradition, because some families are stricter about items like figs, peanuts, or certain dry fruits.
• If you are observing a stricter vow, then fruits or nuts may also be avoided.

If you want, I can also give a strict ekasana fruit-and-nut list or a Digambar/Shwetambar-wise list.