Pat fillets dry + season with salt/pep; heat 1 tbsp oil in skillet over med-high (get that pan hot, otherwise the fish will stick); add to pan skin-side down + sear 5-6 min undisturbed until fish naturally releases from pan; flip fish over + cook 1-2 min until cooked through; add barramundi to plates

Meanwhile, wash + dry 2 tomatoes + thinly slice; thinly slice mozzarella; divide mozz + tomatoes between plates by layering alternating slices of each; drizzle each caprese with 2-3 tbsp pesto + salt/pep—looks great!