Saute in a large oiled (EVOO) pan over high heat: zucchini, peppers, garlic paste, 1/4 tsp red pepper flakes, salt & pepper. 5 minutes. Set aside to cool.
Whisk together eggs, parsley, thyme in a large bowl.
Add panko, cheese, 1/2 cup ketchup, 2 tbsp balsamic, meat, and cooled vegetables. Moosh around with your hands until just combined.
Put into greased or oilded 5×9 loaf pan.
Combine 1/2 cup ketchup, 1/4 cup balsamic, 1/4 tsp red pepper flakes. Pour and brush onto loaf. Leave some to pour onto loaf with 15 minutes left of cook time.
Place in oven for 1 hour.
Remove, pour / brush on remaining glaze concoction, and return to oven for 15 minutes.