For extra flavour, add a tablespoon or two of chopped dill pickles or sweet pickles along with the mayonnaise. Make it at least a few hours in advance for best flavour.

Bring a large saucepan with about 3 quarts of water to a boil over high heat. Cook the macaroni in the boiling salted water for al dente, about 6 to 9 min according to the package instructions. Drain the macaroni in a colander and rinse it under cold running water.

In a large bowl combine the drained tuna and macaroni. Stir in 1 cup of mayonnaise, the lemon juice, green and red bell pepper, and onion. Stir in more mayonnaise, as needed.

Taste and add salt and freshly ground black pepper, as needed.

Cover the macaroni salad and refrigerate it until serving time.

TIPS:
Tbsp or two of chopped dill pickles or capers may be added to the mayonnaise for extra flavour.
To dress it up a bit, serve the pasta salad on lettuce leaves or mixed salad greens with avocado wedges or sliced tomatoes.
Replace the tuna with cooked and cooled shrimp or crabmeat.
Instead of spring onion, use about 1/3 cup of chopped red onion or sweet onion.
Keep pasta salads refrigerated until serving time. If serving at a cookout or picnic, keep the salad on ice in the cooler (40° F or below) until you're ready to eat, and keep the cooler in the shade if at all possible. The salad should not sit out for longer than 2 h - 1 hour if the temperature is above 90° F.