(See cooking tip.) Preheat oven to 200C, fan-forced. Line an oven tray with baking paper. Cut the unpeeled sweet potatoes and carrot into 2cm-thick wedges and put on the lined tray. Drizzle with 2 tsp olive oil, scatter with 1 tsp pepper and garlic seasoning (reduce for a milder pepper kick), season with salt and toss to coat. Roast for 20-22 mins until golden and tender.
Step 2 — Prep dill aioli
While the wedges are roasting, finely chop the dill, discarding the stems. Coarsely chop the capers. Combine the dill, capers and aioli in a bowl. Refrigerate until needed.
Step 3 — Make vinaigrette
Combine 3 tsp extra virgin olive oil and 1½ tsp red wine vinegar in a large bowl. Season with salt and pepper.
Step 4 — Season fish
Combine 2 tsp pepper and garlic seasoning and 2 tsp olive oil in a shallow dish and season with salt. Pat the fish dry with paper towel and rub with the seasoned oil.
Step 5 — Cook fish
Heat a small frypan over medium-high heat until hot. Cook the fish, skin-side down, covered, for 3 mins. Turn and cook, uncovered, for 4 mins or until cooked through (cooking times may vary depending on the thickness of the fillets).
Step 6 — Make salad and serve
Meanwhile, halve the cucumber lengthwise and thinly slice. Thinly slice the avocado. Add the cucumber, avocado and salad leaves to the vinaigrette and gently toss to combine. Divide the salad, wedges and fish among plates. Serve with the dill aioli.