A fresh diet is the best option for ekkies. BUT that fresh diet needs to have a lot of variety. Otherwise, you invite deficiencies or excesses in particular nutrients. Here is the list of fresh foods I usually post when asked about what I feed my ekkies.
In the interests of sharing information, here is what I currently feed Maya and Jolly: I tend to provide between 6 and 8 types of food per feeding (2 meals per day), weighted heavily toward the veggie side as only 1 of the food selections in a given meal is a fruit.
Various sprouts, carrots (very important due to the high content of beta carotene - precursor to Vitamin A), bell peppers (red, yellow, orange and green – also very high in Vitamin A), jalapeno peppers, Jamaican Scotch bonnet peppers, chili peppers, squash (butternut, green and yellow), pumpkin (again, high in Vitamin A), blueberries and pomegranates (both among the most nutritious of fruits), snap peas, broccoli (high in calcium), cactus pears, dragon fruit, persimmon, starfruit, bananas, grapes (only for flavor and hydration. Relatively low in nutrition), kale, turnips, radishes, brown rice, quinoa, cucumbers, endives, dandelion (nutritional powerhouse offered at every meal when seasonally available), sweet potato (cooked), red swiss chard, mustard greens, collard greens, kale, cilantro, parsley, watercress, arugula, granny smith apples, papaya (don’t go too heavy on this, as it is a diarrhetic), African horned melon, hominy, oatmeal (sans sugar or flavoring), kiwi, barley, calendula flowers, fennel, chocho beans and garbanzo beans, as well as Volkman's Fancy Soak and Simmer as a base for the majority of their legumes and grains.
For food accents I'll add one or two types of the following as well: star anise, milk thistle, elder berries, rose hips, hibiscus, bee pollen and chamomile flowers.
Twice a month, I'll give a little hard-boiled egg (with the crushed shell for calcium). Slightly more frequently during a molt.
For their training treats they get an assortment of unsalted nuts (one to three or so per bird in a given day, broken into small pieces and fed as rewards during the training sessions). And for their "goodnight treat", up to a teaspoon or two of seeds.